Paul P. Mealing

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Showing posts with label Consciousness. Show all posts
Showing posts with label Consciousness. Show all posts

Wednesday 24 January 2024

Can AI have free will?

This is a question I’ve never seen asked, let alone answered. I think there are good reasons for that, which I’ll come to later.
 
The latest issue of Philosophy Now (Issue 159, Dec 2023/Jan 2024), which I’ve already referred to in 2 previous posts, has as its theme (they always have a theme), Freewill Versus Determinism. I’ll concentrate on an article by the Editor, Grant Bartley, titled What Is Free Will? That’s partly because he and I have similar views on the topic, and partly because reading the article led me to ask the question at the head of this post (I should point out that he never mentions AI).
 
It's a lengthy article, meaning I won’t be able to fully do it justice, or even cover all aspects that he discusses. For instance, towards the end, he posits a personal ‘pet’ theory that there is a quantum aspect to the internal choice we make in our minds. And he even provides a link to videos he’s made on this topic. I mention this in passing, and will make 2 comments: one, I also have ‘pet’ theories, so I can’t dismiss him out-of-hand; and two, I haven’t watched the videos, so I can’t comment on its plausibility.
 
He starts with an attempt to define what we mean by free will, and what it doesn’t mean. For instance, he differentiates between subconscious choices, which he calls ‘impulses’ and free will, which requires a conscious choice. He also differentiates what he calls ‘making a decision’. I will quote him directly, as I still see this involving free will, if it’s based on making a ‘decision’ from alternative possibilities (as he explains).
 
…sometimes, our decision-making is a choice, that is, mentally deciding between alternative possibilities present to your awareness. But your mind doesn’t always explicitly present you with multiple choices from which to choose. Sometimes no distinct options are present in your awareness, and you must cause your next contents of your mind on the basis of the present content, through intuition and imagination. This is not choice so much as making a decision. (My emphasis)
 
This is worth a detour, because I see what he’s describing in this passage as the process I experience when writing fiction, which is ‘creating’. In this case, some of the content, if not all of it, is subconscious. When you write a story, it feels to you (but no one else) that the characters are real and the story you’re telling already exists. Nevertheless, I still think there’s an element of free will, because you make choices and judgements about what your imagination presents to your consciousness. As I said, this is a detour.
 
I don’t think this is what he’s referring to, and I’ll come back to it later when I introduce AI into the discussion. Meanwhile, I’ll discuss what I think is the nub of his thesis and my own perspective, which is the apparent dependency between consciousness and free will.
 
If conscious causation is not real, why did consciousness evolve at all? What would be the function of awareness if it can’t change behaviour? How could an impotent awareness evolve if it cannot change what the brain’s going to do to help the human body or its genes survive?
(Italics in the original)
 
This is a point I’ve made myself, but Bartley goes further and argues “Since determinism can’t answer these questions, we can know determinism is false.” This is the opposite to Sabine Hossenfelder’s argument (declaration really) that ‘free will is an illusion [therefore false]’.
 
Note that Bartley coins the term, ‘conscious causation’, as a de facto synonym for free will. In fact, he says this explicitly in his conclusion: “If you say there is no free will, you’re basically saying there is no such thing as conscious causation.” I’d have to agree.
 
I made the point in another post that consciousness seems to act outside the causal chain of the Universe, and I feel that’s what Bartley is getting at. In fact, he explicitly cites Kant on this point, who (according to Bartley) “calls the will ‘transcendental’…” He talks at length about ‘soft (or weak) determinism’ and ‘strong determinism’, which I’ve also discussed. Now, the usual argument is that consciousness is ‘caused’ by neuron activity, therefore strong determinism is not broken.
 
To quote Hossenfelder: Your brain is running a calculation, and while it is going on you do not know the outcome of that calculation. So the impression of free will comes from our ‘awareness’ that we think about what we do, along with our inability to predict the result of what we are thinking. (Hossenfelder even uses the term ‘software’ to describe what does the ‘calculating’ in your brain.)
 
And this allows me to segue into AI, because what Hossenfelder describes is what we expect a computer to do. The thing is that while most scientists (and others) believe that AI will eventually become conscious (not sure what Hossenfelder thinks), I’ve never heard or seen anyone argue that AI will have free will. And this is why I don’t think the question at the head of this post has ever been asked. Many of the people who believe that AI will become conscious also don’t believe free will exists.
 
There is another component to this, which I’ve raised before and that’s imagination. I like to quote Raymond Tallis (neuroscientist and also a contributor to Philosophy Now).
 
Free agents, then, are free because they select between imagined possibilities, and use actualities to bring about one rather than another.
(My emphasis)
 
Now, in another post, I argued that AI can’t have imagination in the way we experience it, yet I acknowledge that AI can look at numerous possibilities (like in a game of chess) and 'choose' what it ‘thinks’ is the optimum action. So, in this sense, AI would have ‘agency’, but that’s not free will, because it’s not ‘conscious causation’. And in this sense, I agree with Bartley that ‘making a decision’ does not constitute free will, if it’s what an AI does. So the difference is consciousness. To quote from that same post on this topic.
 
But the key here is imagination. It is because we can imagine a future that we attempt to bring it about - that's free will. And what we imagine is affected by our past, our emotions and our intellectual considerations, but that doesn't make it predetermined.
 
So, if imagination and consciousness are both faculties that separate us from AI, then I can’t see AI having free will, even though it will make ‘decisions’ based on data it receives (as inputs), and those decisions may not be predictable.
 
And this means that AI may not be deterministic either, in the ‘strong’ sense. One of the differences with humans, and other creatures that evolved consciousness, is that consciousness can apparently change the neural pathways of the brain, which I’d argue is the ‘strange loop’ posited by Douglas Hofstadter. (I have discussed free will and brain-plasticity in another post)
 
But there’s another way of looking at this, which differentiates humans from AI. Our decision-making is a combination of logical reasoning and emotion. AI only uses logic, and even then, it uses logic differently to us. It uses a database of samples and possibilities to come up with a ‘decision’ (or output), but without using the logic to arise at that decision the way we would. In other words, it doesn’t ‘understand’ the decision, like when it translates between languages, for example.
 
There is a subconscious and conscious component to our decision-making. Arguably, the subconscious component is analogous to what a computer does with algorithm-based software (as per Hossenfelder’s description). But there is no analogous conscious component in AI, which makes a choice or decision. In other words, there is no ‘conscious causation’, therefore no free will, as per Bartley’s definition.
 

Monday 23 October 2023

The mystery of reality

Many will say, ‘What mystery? Surely, reality just is.’ So, where to start? I’ll start with an essay by Raymond Tallis, who has a regular column in Philosophy Now called, Tallis in Wonderland – sometimes contentious, often provocative, always thought-expanding. His latest in Issue 157, Aug/Sep 2023 (new one must be due) is called Reflections on Reality, and it’s all of the above.
 
I’ve written on this topic many times before, so I’m sure to repeat myself. But Tallis’s essay, I felt, deserved both consideration and a response, partly because he starts with the one aspect of reality that we hardly ever ponder, which is doubting its existence.
 
Actually, not so much its existence, but whether our senses fool us, which they sometimes do, like when we dream (a point Tallis makes himself). And this brings me to the first point about reality that no one ever seems to discuss, and that is its dependence on consciousness, because when you’re unconscious, reality ceases to exist, for You. Now, you might argue that you’re unconscious when you dream, but I disagree; it’s just that your consciousness is misled. The point is that we sometimes remember our dreams, and I can’t see how that’s possible unless there is consciousness involved. If you think about it, everything you remember was laid down by a conscious thought or experience.
 
So, just to be clear, I’m not saying that the objective material world ceases to exist without consciousness – a philosophical position called idealism (advocated by Donald Hoffman) – but that the material objective world is ‘unknown’ and, to all intents and purposes, might as well not exist if it’s unperceived by conscious agents (like us). Try to imagine the Universe if no one observed it. It’s impossible, because the word, ‘imagine’, axiomatically requires a conscious agent.
 
Tallis proffers a quote from celebrated sci-fi author, Philip K Dick: 'Reality is that which, when you stop believing in it, doesn’t go away' (from The Shifting Realities of Philip K Dick, 1955). And this allows me to segue into the world of fiction, which Tallis doesn’t really discuss, but it’s another arena where we willingly ‘suspend disbelief' to temporarily and deliberately conflate reality with non-reality. This is something I have in common with Dick, because we have both created imaginary worlds that are more than distorted versions of the reality we experience every day; they’re entirely new worlds that no one has ever experienced in real life. But Dick’s aphorism expresses this succinctly. The so-called reality of these worlds, in these stories, only exist while we believe in them.
 
I’ve discussed elsewhere how the brain (not just human but animal brains, generally) creates a model of reality that is so ‘realistic’, we actually believe it exists outside our head.
 
I recently had a cataract operation, which was most illuminating when I took the bandage off, because my vision in that eye was so distorted, it made me feel sea sick. Everything had a lean to it and it really did feel like I was looking through a lens; I thought they had botched the operation. With both eyes open, it looked like objects were peeling apart. So I put a new eye patch on, and distracted myself for an hour by doing a Sudoku problem. When I had finished it, I took the patch off and my vision was restored. The brain had made the necessary adjustments to restore the illusion of reality as I normally interacted with it. And that’s the key point: the brain creates a model so accurately, integrating all our senses, but especially, sight, sound and touch, that we think the model is the reality. And all creatures have evolved that facility simply so they can survive; it’s a matter of life-and-death.
 
But having said all that, there are some aspects of reality that really do only exist in your mind, and not ‘out there’. Colour is the most obvious, but so is sound and smell, which all may be experienced differently by other species – how are we to know? Actually, we do know that some animals can hear sounds that we can’t and see colours that we don’t, and vice versa. And I contend that these sensory experiences are among the attributes that keep us distinct from AI.
 
Tallis makes a passing reference to Kant, who argued that space and time are also aspects of reality that are produced by the mind. I have always struggled to understand how Kant got that so wrong. Mind you, he lived more than a century before Einstein all-but proved that space and time are fundamental parameters of the Universe. Nevertheless, there are more than a few physicists who argue that the ‘flow of time’ is a purely psychological phenomenon. They may be right (but arguably for different reasons). If consciousness exists in a constant present (as expounded by Schrodinger) and everything else becomes the past as soon as it happens, then the flow of time is guaranteed for any entity with consciousness. However, many physicists (like Sabine Hossenfelder), if not most, argue that there is no ‘now’ – it’s an illusion.
 
Speaking of Schrodinger, he pointed out that there are fundamental differences between how we sense sight and sound, even though they are both waves. In the case of colour, we can blend them to get a new colour, and in fact, as we all know, all the colours we can see can be generated by just 3 colours, which is how the screens on all your devices work. However, that’s not the case with sound, otherwise we wouldn’t be able to distinguish all the different instruments in an orchestra. Just think: all the complexity is generated by a vibrating membrane (in the case of a speaker) and somehow our hearing separates it all. Of course, it can be done mathematically with a Fourier transform, but I don’t think that’s how our brains work, though I could be wrong.
 
And this leads me to discuss the role of science, and how it challenges our everyday experience of reality. Not surprisingly, Tallis also took his discussion in that direction. Quantum mechanics (QM) is the logical starting point, and Tallis references Bohr’s Copenhagen interpretation, ‘the view that the world has no definite state in the absence of observation.’ Now, I happen to think that there is a logical explanation for this, though I’m not sure anyone else agrees. If we go back to Schrodinger again, but this time his eponymous equation, it describes events before the ‘observation’ takes place, albeit with probabilities. What’s more, all the weird aspects of QM, like the Uncertainty Principle, superposition and entanglement, are all mathematically entailed in that equation. What’s missing is relativity theory, which has since been incorporated into QED or QFT.
 
But here’s the thing: once an observation or ‘measurement’ has taken place, Schrodinger’s equation no longer applies. In other words, you can’t use Schrodinger’s equation to describe something that has already happened. This is known as the ‘measurement problem’, because no one can explain it. But if QM only describes things that are yet to happen, then all the weird aspects aren’t so weird.
 
Tallis also mentions Einstein’s 'block universe', which infers past, present and future all exist simultaneously. In fact, that’s what Sabine Hossenfelder says in her book, Existential Physics:
 
The idea that the past and future exist in the same way as the present is compatible with all we currently know.

 
And:

Once you agree that anything exists now elsewhere, even though you see it only later, you are forced to accept that everything in the universe exists now. (Her emphasis.)
 
I’m not sure how she resolves this with cosmological history, but it does explain why she believes in superdeterminism (meaning the future is fixed), which axiomatically leads to her other strongly held belief that free will is an illusion; but so did Einstein, so she’s in good company.
 
In a passing remark, Tallis says, ‘science is entirely based on measurement’. I know from other essays that Tallis has written, that he believes the entire edifice of mathematics only exists because we can measure things, which we then applied to the natural world, which is why we have so-called ‘natural laws’. I’ve discussed his ideas on this elsewhere, but I think he has it back-to-front, whilst acknowledging that our ability to measure things, which is an extension of counting, is how humanity was introduced to mathematics. In fact, the ancient Greeks put geometry above arithmetic because it’s so physical. This is why there were no negative numbers in their mathematics, because the idea of a negative volume or area made no sense.
 
But, in the intervening 2 millennia, mathematics took on a life of its own, with such exotic entities like negative square roots and non-Euclidean geometry, which in turn suddenly found an unexpected home in QM and relativity theory respectively. All of a sudden, mathematics was informing us about reality before measurements were even made. Take Schrodinger’s wavefunction, which lies at the heart of his equation, and can’t be measured because it only exists in the future, assuming what I said above is correct.
 
But I think Tallis has a point, and I would argue that consciousness can’t be measured, which is why it might remain inexplicable to science, correlation with brain waves and their like notwithstanding.
 
So what is the mystery? Well, there’s more than one. For a start there is consciousness, without which reality would not be perceived or even be known, which seems to me to be pretty fundamental. Then there are the aspects of reality which have only recently been discovered, like the fact that time and space can have different ‘measurements’ dependent on the observer’s frame of reference. Then there is the increasing role of mathematics in our comprehension of reality at scales both cosmic and subatomic. In fact, given the role of numbers and mathematical relationships in determining fundamental constants and natural laws of the Universe, it would seem that mathematics is an inherent facet of reality.
 

Wednesday 7 June 2023

Consciousness, free will, determinism, chaos theory – all connected

 I’ve said many times that philosophy is all about argument. And if you’re serious about philosophy, you want to be challenged. And if you want to be challenged you should seek out people who are both smarter and more knowledgeable than you. And, in my case, Sabine Hossenfelder fits the bill.
 
When I read people like Sabine, and others whom I interact with on Quora, I’m aware of how limited my knowledge is. I don’t even have a university degree, though I’ve attempted a number of times. I’ve spent my whole life in the company of people smarter than me, including at school. Believe it or not, I still have occasional contact with them, through social media and school reunions. I grew up in a small rural town, where the people you went to school with feel like siblings.
 
Likewise, in my professional life, I have always encountered people cleverer than me – it provides perspective.
 
In her book, Existential Physics; A Scientist’s Guide to Life’s Biggest Questions, Sabine interviews people who are possibly even smarter than she is, and I sometimes found their conversations difficult to follow. To be fair to Sabine, she also sought out people who have different philosophical views to her, and also have the intellect to match her.
 
I’m telling you all this to put things in perspective. Sabine has her prejudices like everyone else, some of which she defends better than others. I concede that my views are probably more simplistic than hers, and I support my challenges with examples that are hopefully easy to follow. Our points of disagreement can be distilled down to a few pertinent topics, which are time, consciousness, free will and chaos. Not surprisingly, they are all related – what you believe about one, affects what you believe about the others.
 
Sabine is very strict about what constitutes a scientific theory. She argues that so-called theories like the multiverse have ‘no explanatory power’, because they can’t be verified or rejected by evidence, and she calls them ‘ascientific’. She’s critical of popularisers like Brian Cox who tell us that there could be an infinite number of ‘you(s)’ in an infinite multiverse. She distinguishes between beliefs and knowledge, which is a point I’ve made myself. Having said that, I’ve also argued that beliefs matter in science. She puts all interpretations of quantum mechanics (QM) in this category. She keeps emphasising that it doesn’t mean they are wrong, but they are ‘ascientific’. It’s part of the distinction that I make between philosophy and science, and why I perceive science as having a dialectical relationship with philosophy.
 
I’ll start with time, as Sabine does, because it affects everything else. In fact, the first chapter in her book is titled, Does The Past Still Exist? Basically, she argues for Einstein’s ‘block universe’ model of time, but it’s her conclusion that ‘now is an illusion’ that is probably the most contentious. This critique will cite a lot of her declarations, so I will start with her description of the block universe:
 
The idea that the past and future exist in the same way as the present is compatible with all we currently know.
 
This viewpoint arises from the fact that, according to relativity theory, simultaneity is completely observer-dependent. I’ve discussed this before, whereby I argue that for an observer who is moving relative to a source, or stationary relative to a moving source, like the observer who is standing on the platform of Einstein’s original thought experiment, while a train goes past, knows this because of the Doppler effect. In other words, an observer who doesn’t see a Doppler effect is in a privileged position, because they are in the same frame of reference as the source of the signal. This is why we know the Universe is expanding with respect to us, and why we can work out our movement with respect to the CMBR (cosmic microwave background radiation), hence to the overall universe (just think about that).
 
Sabine clinches her argument by drawing a spacetime diagram, where 2 independent observers moving away from each other, observe a pulsar with 2 different simultaneities. One, who is traveling towards the pulsar, sees the pulsar simultaneously with someone’s birth on Earth, while the one travelling away from the pulsar sees it simultaneously with the same person’s death. This is her slam-dunk argument that ‘now’ is an illusion, if it can produce such a dramatic contradiction.
 
However, I drew up my own spacetime diagram of the exact same scenario, where no one is travelling relative to anyone one else, yet create the same apparent contradiction.


 My diagram follows the convention in that the horizontal axis represents space (all 3 dimensions) and the vertical axis represents time. So the 4 dotted lines represent 4 observers who are ‘stationary’ but ‘travelling through time’ (vertically). As per convention, light and other signals are represented as diagonal lines of 45 degrees, as they are travelling through both space and time, and nothing can travel faster than them. So they also represent the ‘edge’ of their light cones.
 
So notice that observer A sees the birth of Albert when he sees the pulsar and observer B sees the death of Albert when he sees the pulsar, which is exactly the same as Sabine’s scenario, with no relativity theory required. Albert, by the way, for the sake of scalability, must have lived for thousands of years, so he might be a tree or a robot.
 
But I’ve also added 2 other observers, C and D, who see the pulsar before Albert is born and after Albert dies respectively. But, of course, there’s no contradiction, because it’s completely dependent on how far away they are from the sources of the signals (the pulsar and Earth).
 
This is Sabine’s perspective:
 
Once you agree that anything exists now elsewhere, even though you see it only later, you are forced to accept that everything in the universe exists now. (Her emphasis.)
 
I actually find this statement illogical. If you take it to its logical conclusion, then the Big Bang exists now and so does everything in the universe that’s yet to happen. If you look at the first quote I cited, she effectively argues that the past and future exist alongside the present.
 
One of the points she makes is that, for events with causal relationships, all observers see the events happening in the same sequence. The scenario where different observers see different sequences of events have no causal relationships. But this begs a question: what makes causal events exceptional? What’s more, this is fundamental, because the whole of physics is premised on the principle of causality. In addition, I fail to see how you can have causality without time. In fact, causality is governed by the constant speed of light – it’s literally what stops everything from happening at once.
 
Einstein also believed in the block universe, and like Sabine, he argued that, as a consequence, there is no free will. Sabine is adamant that both ‘now’ and ‘free will’ are illusions. She argues that the now we all experience is a consequence of memory. She quotes Carnap that our experience of ‘past, present and future can be described and explained by psychology’ – a point also made by Paul Davies. Basically, she argues that what separates our experience of now from the reality of no-now (my expression, not hers) is our memory.
 
Whereas, I think she has it back-to-front, because, as I’ve pointed out before, without memory, we wouldn’t know we are conscious. Our brains are effectively a storage device that allows us to have a continuity of self through time, otherwise we would not even be aware that we exist. Memory doesn’t create the sense of now; it records it just like a photograph does. The photograph is evidence that the present becomes the past as soon as it happens. And our thoughts become memories as soon as they happen, otherwise we wouldn’t know we think.
 
Sabine spends an entire chapter on free will, where she persistently iterates variations on the following mantra:
 
The future is fixed except for occasional quantum events that we cannot influence.

 
But she acknowledges that while the future is ‘fixed’, it’s not predictable. And this brings us to chaos theory. Sabine discusses chaos late in the book and not in relation to free will. She explicates what she calls the ‘real butterfly effect’.
 
The real butterfly effect… means that even arbitrarily precise initial data allow predictions for only a finite amount of time. A system with this behaviour would be deterministic and yet unpredictable.
 
Now, if deterministic means everything physically manifest has a causal relationship with something prior, then I agree with her. If she means that therefore ‘the future is fixed’, I’m not so sure, and I’ll explain why. By specifying ‘physically manifest’, I’m excluding thoughts and computer algorithms that can have an effect on something physical, whereas the cause is not so easily determined. For example, In the case of the algorithm, does it go back to the coder who wrote it?
 
My go-to example for chaos is tossing coins, because it’s so easy to demonstrate and it’s linked to probability theory, as well as being the very essence of a random event. One of the key, if not definitive, features of a chaotic phenomenon is that, if you were to rerun it, you’d get a different result, and that’s fundamental to probability theory – every coin toss is independent of any previous toss – they are causally independent. Unrepeatability is common among chaotic systems (like the weather). Even the Earth and Moon were created from a chaotic event.
 
I recently read another book called Quantum Physics Made Me Do It by Jeremie Harris, who argues that tossing a coin is not random – in fact, he’s very confident about it. He’s not alone. Mark John Fernee, a physicist with Qld Uni, in a personal exchange on Quora argued that, in principle, it should be possible to devise a robot to perform perfectly predictable tosses every time, like a tennis ball launcher. But, as another Quora contributor and physicist, Richard Muller, pointed out: it’s not dependent on the throw but the surface it lands on. Marcus du Sautoy makes the same point about throwing dice and provides evidence to support it.
 
Getting back to Sabine. She doesn’t discuss tossing coins, but she might think that the ‘imprecise initial data’ is the actual act of tossing, and after that the outcome is determined, even if can’t be predicted. However, the deterministic chain is broken as soon as it hits a surface.
 
Just before she gets to chaos theory, she talks about computability, with respect to Godel’s Theorem and a discussion she had with Roger Penrose (included in the book), where she says:
 
The current laws of nature are computable, except for that random element from quantum mechanics.
 
Now, I’m quoting this out of context, because she then argues that if they were uncomputable, they open the door to unpredictability.
 
My point is that the laws of nature are uncomputable because of chaos theory, and I cite Ian Stewart’s book, Does God Play Dice? In fact, Stewart even wonders if QM could be explained using chaos (I don’t think so). Chaos theory has mathematical roots, because not only are the ‘initial conditions’ of a chaotic event impossible to measure, they are impossible to compute – you have to calculate to infinite decimal places. And this is why I disagree with Sabine that the ‘future is fixed’.
 
It's impossible to discuss everything in a 223 page book on a blog post, but there is one other topic she raises where we disagree, and that’s the Mary’s Room thought experiment. As she explains it was proposed by philosopher, Frank Jackson, in 1982, but she also claims that he abandoned his own argument. After describing the experiment (refer this video, if you’re not familiar with it), she says:
 
The flaw in this argument is that it confuses knowledge about the perception of colour with the actual perception of it.
 
Whereas, I thought the scenario actually delineated the difference – that perception of colour is not the same as knowledge. A person who was severely colour-blind might never have experienced the colour red (the specified colour in the thought experiment) but they could be told what objects might be red. It’s well known that some animals are colour-blind compared to us and some animals specifically can’t discern red. Colour is totally a subjective experience. But I think the Mary’s room thought experiment distinguishes the difference between human perception and AI. An AI can be designed to delineate colours by wavelength, but it would not experience colour the way we do. I wrote a separate post on this.
 
Sabine gives the impression that she thinks consciousness is a non-issue. She talks about the brain like it’s a computer.
 
You feel you have free will, but… really, you’re running a sophisticated computation on your neural processor.
 
Now, many people, including most scientists, think that, because our brains are just like computers, then it’s only a matter of time before AI also shows signs of consciousness. Sabine doesn’t make this connection, even when she talks about AI. Nevertheless, she discusses one of the leading theories of neuroscience (IIT, Information Integration Theory), based on calculating the amount of information processed, which gives a number called phi (Φ). I came across this when I did an online course on consciousness through New Scientist, during COVID lockdown. According to the theory, this number provides a ‘measure of consciousness’, which suggests that it could also be used with AI, though Sabine doesn’t pursue that possibility.
 
Instead, Sabine cites an interview in New Scientist with Daniel Bor from the University of Cambridge: “Phi should decrease when you go to sleep or are sedated… but work in Bor’s laboratory has shown that it doesn’t.”
 
Sabine’s own view:
 
Personally, I am highly skeptical that any measure consisting of a single number will ever adequately represent something as complex as human consciousness.
 
Sabine discusses consciousness at length, especially following her interview with Penrose, and she gives one of the best arguments against panpsychism I’ve read. Her interview with Penrose, along with a discussion on Godel’s Theorem, which is another topic, discusses whether consciousness is computable or not. I don’t think it is and I don’t think it’s algorithmic.
 
She makes a very strong argument for reductionism: that the properties we observe of a system can be understood from studying the properties of its underlying parts. In other words, that emergent properties can be understood in terms of the properties that it emerges from. And this includes consciousness. I’m one of those who really thinks that consciousness is the exception. Thoughts can cause actions, which is known as ‘agency’.
 
I don’t claim to understand consciousness, but I’m not averse to the idea that it could exist outside the Universe – that it’s something we tap into. This is completely ascientific, to borrow from Sabine. As I said, our brains are storage devices and sometimes they let us down, and, without which, we wouldn’t even know we are conscious. I don’t believe in a soul. I think the continuity of the self is a function of memory – just read The Lost Mariner chapter in Oliver Sacks’ book, The Man Who Mistook His Wife For A Hat. It’s about a man suffering from retrograde amnesia, so his life is stuck in the past because he’s unable to create new memories.
 
At the end of her book, Sabine surprises us by talking about religion, and how she agrees with Stephen Jay Gould ‘that religion and science are two “nonoverlapping magisteria!”. She makes the point that a lot of scientists have religious beliefs but won’t discuss them in public because it’s taboo.
 
I don’t doubt that Sabine has answers to all my challenges.
 
There is one more thing: Sabine talks about an epiphany, following her introduction to physics in middle school, which started in frustration.
 
Wasn’t there some minimal set of equations, I wanted to know, from which all the rest could be derived?
 
When the principle of least action was introduced, it was a revelation: there was indeed a procedure to arrive at all these equations! Why hadn’t anybody told me?

 
The principle of least action is one concept common to both the general theory of relativity and quantum mechanics. It’s arguably the most fundamental principle in physics. And yes, I posted on that too.

 

Wednesday 31 May 2023

Immortality; from the Pharaohs to cryonics

 I thought the term was cryogenics, but a feature article in the Weekend Australian Magazine (27-28 May 2023) calls the facilities that perform this process, cryonics, and looking up my dictionary, there is a distinction. Cryogenics is about low temperature freezing in general, and cryonics deals with the deep-freezing of bodies specifically, with the intention of one day reviving them.
 
The article cites a few people, but the author, Ross Bilton, features an Australian, Peter Tsolakides, who is in my age group. From what the article tells me, he’s a software engineer who has seen many generations of computer code and has also been a ‘globe-trotting executive for ExxonMobil’.
 
He’s one of the drivers behind a cryonic facility in Australia – its first – located at Holbrook, which is roughly halfway between Melbourne and Sydney. In fact, I often stop at Holbrook for a break and meal on my interstate trips. According to my car’s odometer it is almost exactly half way between my home and my destination, which is a good hour short of Sydney, so it’s actually closer to Melbourne, but not by much.
 
I’m not sure when Tsolakides plans to enter the facility, but he’s forecasting his resurrection in around 250 years time, when he expects he may live for another thousand years. Yes, this is science fiction to most of us, but there are some science facts that provide some credence to this venture.
 
For a start, we already cryogenically freeze embryos and sperm, and we know it works for them. There is also the case of Ewa Wisnierska, 35, a German paraglider taking part in an international competition in Australia, when she was sucked into a storm and elevated to 9947 metres (jumbo jet territory, and higher than Everest). Needless to say, she lost consciousness and spent a frozen 45 mins before she came back to Earth. Quite a miracle and I’ve watched a doco on it. She made a full recovery and was back at her sport within a couple of weeks. And I know of other cases, where the brain of a living person has been frozen to keep them alive, as counter-intuitive as that may sound.
 
Believe it or not, scientists are divided on this, or at least cautious about dismissing it outright. Many take the position, ‘Never say never’. And I think that’s fair enough, because it really is impossible to predict the future when it comes to humanity. It’s not surprising that advocates, like Tsolakides, can see a future where this will become normal for most humans. People who decline immortality will be the exception and not the norm. And I can imagine, if this ‘procedure’ became successful and commonplace, who would say no?
 
Now, I write science fiction, and I have written a story where a group of people decided to create an immortal human race, who were part machine. It’s a reflection of my own prejudices that I portrayed this as a dystopia, but I could have done the opposite.
 
There may be an assumption that if you write science fiction then you are attempting to predict the future, but I make no such claim. My science fiction is complete fantasy, but, like all science fiction, it addresses issues relevant to the contemporary society in which it was created.
 
Getting back to the article in the Weekend Australian, there is an aspect of this that no one addressed – not directly, anyway. There’s no point in cheating death if you can’t cheat old age. In the case of old age, you are dealing with a fundamental law of the Universe, entropy, the second law of thermodynamics. No one asked the obvious question: how do you expect to live for 1,000 years without getting dementia?
 
I think some have thought about this, because, in the same article, they discuss the ultimate goal of downloading their memories and their thinking apparatus (for want of a better term) into a computer. I’ve written on this before, so I won’t go into details.
 
Curiously, I’m currently reading a book by Sabine Hossenfelder called Existential Physics; A Scientist’s Guide to Life’s Biggest Questions, which you would think could not possibly have anything to say on this topic. Nevertheless:
 
The information that makes you you can be encoded in many different physical forms. The possibility that you might one day upload yourself to a computer and continue living a virtual life is arguably beyond present-day technology. It might sound entirely crazy, but it’s compatible with all we currently know.
 
I promise to write another post on Sabine’s book, because she’s nothing if not thought-provoking.
 
So where do I stand? I don’t want immortality – I don’t even want a gravestone, and neither did my father. I have no dependents, so I won’t live on in anyone’s memory. The closest I’ll get to immortality are the words on this blog.

Sunday 1 January 2023

The apparent dichotomous relationship between consciousness and determinism

 Someone (Graham C Lindsay) asked me a question on Quora:

Is it true that every event, without exception, is fully caused by its antecedent conditions?

 Graham Lindsay is Scottish, a musician (50 years a keyboard player) and by his own admission, has a lot of letters after his name. I should point out that I have none. The Quora algorithm gave me the impression that he asked me specifically, but maybe he didn't. As I say at the outset, David Cook gives a more erudite answer than me. It so happens, I've had correspondence with David Cook (he contacted me) and he sent me a copy of his book of poetry. He's a retired psychiatrist and lecturer.

In fact, I recommend that you read his answer in conjunction with mine - we take subtley different approaches without diverging too far apart.

I concede that there's not a lot that's new in this post, but I've found that rearranging pre-existing ideas can throw up new insights and thought-provocations.


Thanks for asking me, I feel flattered. To be honest, I think David Cook gives a better and more erudite answer than I can. I’d also recommend you ask Mark John Fernee (physicist with University of Queensland) who has some ideas on this subject.

I’ll start with Fernee, because he argues for determinism without arguing for superdeterminism, as Sabine Hossenfelder does. To answer the question directly, it appears to be true to the best of our knowledge. What do I mean by that? Everything in the Universe that has happened to date seems to have a cause, and it would appear that there is a causal chain going all the way back to the Big Bang. The future, however, is another matter. In the future we have multiple paths that are expressed in QM as probabilities. In fact, Freeman Dyson argued that QM can only describe the future and not the past. As another Quora contributor (David Moore) pointed out, you can only have a probability less than one for an event in the future. If it’s in the past, it has a probability of One.

In the Universe, chaos rules at virtually every level. A lot of people are unaware that even the orbits of the planets are chaotic, so they are only predictable within a range of hundreds of millions of years. Hossenfelder (whom I cited earlier) has a YouTube video where she demonstrates how a chaotic phenomenon always has a limited horizon of predictability (for want of a better phrase). With the weather it’s about 10 days. This doesn’t stop the Universe being deterministic up to the present, while being unpredictable in the future. The thing about chaotic phenomena is that if you rerun them you’d get a different outcome. This applies to the Universe itself. The best known example is the tossing of a coin, which is a chaotic event. It’s fundamental to probability theory that every coin toss is independent of previous tosses.

Regarding QM, we all know that Schrodinger’s equation is deterministic and time-reversible. However, as Fernee points out, the act of ‘measurement’ creates an irreversible event. To quote Paul Davies:

The very act of measurement breaks the time symmetry of quantum mechanics in a process sometimes described as the collapse of the wave function... the rewind button is destroyed as soon as that measurement is made.

David Cook, in his answer, mentions the role of imagination in his closing paragraph and I don’t think that can be overstated. To quote another philosopher, Raymond Tallis:

Free agents, then, are free because they select between imagined possibilities, and use actualities to bring about one rather than another.

I feel this is as good a description of free will as you can get. And like David, I think imagination is key here. And this raises the issue of consciousness, because I’m unsure how it fits into the scheme of things. As Schrodinger pointed out, consciousness exists in a constant present, which means that without memory you wouldn’t know you are conscious. And this has actually happened, where people have behaved consciously without being aware of it. It happened to my father when he was knocked unconscious in a boxing ring, and I know of other incidents. In my father’s case, he got back on his feet and knocked out his opponent – when he came to, he was standing over his opponent with no memory of what happened.

I tell this anecdote, because it begs a question. If we can respond to events that are harmful or life-threatening without conscious awareness, then why do we need consciousness?

All evidence of consciousness points to a neural substrate dependency. We don’t find consciousness in machines despite predictions that we eventually will. But it seems to me that consciousness acts outside the causal chain of the Universe. We have the ability, as do other sentient creatures, to perform actions on our physical environment that are purely determined by imagination, therefore thought. And we can even use thought to change the neural pathways in our brains, like a feedback loop, or as Douglas Hofstadter coined it, a ‘strange loop’.

 

Addendum: For my own benefit, I've coined the terms, 'weak determinism' and 'strong determinism', to differentiate between deterministic causality and superdeterminism respectively. I know there's a term called 'compatible determinism', from Hume, which, according to other sources, is the same as weak determinism, as I expound on below.

The point is that weak determinism (causality) is compatible with free will, which is what Hume argued, according to the Stanford Encyclopedia reference (linked above). However, Hume famously challenged the very idea of causality, whereas I'd argue that 'weak determinism' is completely dependent on causality being true and a universal principle. On the other hand, 'strong determinism' or superdeterminism (as advocated by Sabine Hossenfelder) axiomatically rules out free will, so there is a fundamental difference.

For the sake of clarity, the determinism I refer to in my essay (and its title) is weak determinism.

Saturday 25 December 2021

Revisiting Donald Hoffman’s alternative theory of evolution

 Back in November 2016, so 5 years ago, I wrote a post in response to an academic paper by Donald Hoffman and Chetan Prakash called Objects of Consciousness, where I specifically critiqued their ideas on biological evolution. Despite co-authoring the paper, I believe this particular aspect of their paper is predominantly Hoffman’s, based on an article he wrote for New Scientist, where he expressed similar views. One of his key arguments was that natural selection favours ‘fitness’ over ‘truth’.

 

...we find that natural selection does not, in general, favor perceptions that are true reports of objective properties of the environment. Instead, it generally favors perceptual strategies that are tuned to fitness.

 

One way to use fewer calories is to see less truth, especially truth that is not informative about fitness. (My emphasis)

 

What made me revisit this was an interview in Philosophy Now (Issue 147, Dec 2021/Jan 2022) with Samuel Grove, who recently published Retrieving Darwin’s Revolutionary Idea: The Reluctant Radical. According to Grove, Darwin was reluctant to publish The Decent of Man, because applying natural selection to humans was controversial, despite the success of The Origin of Species by Means of Natural Selection (full title). The connection to Hoffman’s argument is that Darwin struggled with the idea that evolution could ‘select’ for ‘truth’. To quote Grove:

 

Natural selection is premised on three laws: the law of inheritance, the law of variation, and the law of superfecundity (where organisms produce more offspring than can possibly survive). Together, these laws produce selection, and over the course of time, evolution. Well, Darwin’s question was, how could evolution produce a subject capable of knowing these very laws? Or, why would evolution select for fidelity to truth or laws? Selection favours survival, not truth. (My emphasis again)

 

Darwin turned to arguments, that as Grove points out, were ‘the common garden variety racism of the time’ – specifically, ‘group selection’ that favoured Anglo Saxon groups. Apparently, Darwin was reluctant to consider ‘group selection’ (as opposed to ‘individual selection’), but did so because it led to a resolution that would have been politically acceptable in his day. I will return to this point later.

 

So, even according to Darwin, Hoffman may have a point, though I’m not sure that Darwin and Hoffman are even talking about the same idea of ‘truth’. More on that later.

 

For those unfamiliar with Hoffman, his entire argument centres on the fundamental idea that ‘nothing exists unperceived, including space and time’. For more details, read my previous post, or read his co-authored paper with Prakash. I need to say upfront that I find it hard to take Hoffman seriously. Every time I read or listen to him, I keep expecting him to say, ‘Ah, see, I fooled the lot of you.’ His ideas only make sense to me if he believes we live in a computer simulation, which he’s never claimed. In fact, that would be my first question to him, if I ever met him. It’s an idea that has some adherents. Just on that, I would like to point out that chaos is incomputable, and the Universe is chaotic on a number of levels, including evolution, as it turns out.

 

In a previous life, I sometimes became involved in contractual disputes on major engineering projects (in Australia and US), preparing evidence for lawyers, and having to address opponents’ arguments. What I found in a number of cases, was that people prepared simple arguments that were nevertheless compelling. In fact, they often delivered them as if they were a fait accompli. In most of these cases, I found that by digging a little deeper, they could be challenged successfully. I have to admit that I’m reminded of this when I examine Hoffman’s argument on natural selection favouring ‘fitness’ over ‘truth’.

 

Partly, this is because his arguments highlight contradictions in his own premise and partly because one of his key arguments is contradicted by evidence, which, I concede, he may not be aware of.

 

For a start, what does Hoffman mean by ‘fitness’?

 

He talks about fitness in terms of predators and prey:

 

But in the real world where predators are on the prowl and prey must be wary, the race is often to the swift. It is the slower gazelle that becomes lunch for the swifter cheetah

 

This quote is out of context, where he’s arguing that ‘swiftness’ in response, be it the gazelle or the cheetah, favours less information, therefore less time; over more information, therefore lost time. Leaving aside the fact that survival of either animal is dependent on the accuracy of their ‘modelling’ of their environment, if the animal being chased or doing the chasing ‘doesn’t exist unperceived’, then they might as well be in a dream. In fact, we often find ourselves being chased in a dream, which has no consequences to our ‘survival’ in real life. The argument contradicts the premise.

 

Hoffman and Prakash quote Steven Palmer from a ‘graduate-level textbook’ (1999):

 

Evolutionarily speaking, visual perception is useful only if it is reasonably accurate . . . Indeed, vision is useful precisely because it is so accurate. By and large, what you see is what you get. When this is true, we have what is called veridical perception . . . perception that is consistent with the actual state of affairs in the environment. This is almost always the case with vision . . .  (Authors’ emphasis)

 

Hoffman and Prakash then argue that ‘using Monte Carlo simulations of evolutionary games and genetic algorithms, we find that natural selection does not, in general, favor perceptions that are true reports of objective properties of the environment’. In other words, they effectively argue that Palmer’s emphasis on ‘veridical perception’ is wrong. I can’t argue with their Monte Carlo simulations, because they don’t provide the data. However, real world evidence would suggest that Palmer is correct.

 

I read a story on Quora by a wildlife ranger about eagles who have had one eye damaged, usually in intra-species mid-air fights. In nearly all cases (he described one exception), an eagle who is blind in one eye needs to be euthanised because they would invariably starve to death due to an inability to catch prey. So here you have ‘fitness’ dependent on vision being accurate.

 

Leaving aside all this nit-picking about natural selection favouring ‘fitness’ over ‘truth’, how does it support their fundamental thesis that reality only exists in the mind? According to them, their theory of evolution ‘proves’ that reality doesn’t exist unperceived. Can you even have evolution if reality doesn’t exist (except in the mind)?

 

And this brings me back to Darwin, because what he didn’t consider was that, in the case of humans, cultural evolution has overtaken biological evolution, and this is unique to humanity. I wrote another post where I argue that The search for ultimate truth is unattainable, but there are 'truths' we have found throughout the history of our cultural evolution and they are in mathematics. It’s true that evolution didn’t select for this; it’s an unexpected by-product, but it has led to the understanding of laws governing the very Universe that even Darwin would be amazed to know. 



Saturday 17 July 2021

A philosophical exploration of Type A and Type B time

 This arose from a question referred to me on Quora. As part of my discussion, I wondered into philosophical territory originally posited over a century ago by a forgotten philosopher, J.M.E. McTaggart, thanks to A.C. Grayling (English philosophers seem to have a predilection for using initials). It seems to fit seamlessly into my own particular philosophy on the relationship between time and consciousness.

 

The original question on Quora, asked by Adriana Moraes (from Sao Paulo, Brazil):

 

How does the past, present, and future exist simultaneously?

 

I don’t believe they do. In fact, I contend that past, present and future are only meaningful concepts in some creature’s mind; which means that I don’t believe it’s a cognitive state unique to humanity.

 

We are only aware of the past because we have memories. In fact, without memory, you wouldn’t know you are conscious. Consciousness exists in a constant present, so time for us is always ‘now’. This, of course, applies to all sentient creatures. For all events that we witness or observe, ‘now’ is ephemeral – they become the past as soon as they happen - which is demonstrated every time someone takes a photo. We say it ‘freezes time’, when in fact, it records an event that would otherwise vanish.

 

Past, present and future require a reference point, and consciousness provides that reference point. We imagine futures, and curiously, the same part of the brain that imagines what might happen, conjures up memories of what has happened. This makes sense when one realises that we attempt to predict the future based on what we have experienced in the past. 

 

Raymond Tallis, who has a background in neuroscience and writes books as well as a regular column in Philosophy Now, makes the observation that our ability to ‘imagine’ future ‘possibilities’, and select one to make ‘actual’, is the very definition of free will, only he calls it 'agency'.

 

In 1908, an Oxford philosopher, J.M.E. McTaggart published a paper titled, On the Unreality of Time in the journal, Mind (ref: A.C. Grayling, The History of Philosophy, 2019). McTaggart argued that there are 2 types of time: Type A, which is based on using the ‘present’ as a reference point for ‘past-present-future’; and Type B, which is just the ordering of events into ‘earlier than/later than’. He contended, in effect, that because ‘now’ is constantly changing, you get contradictions with Type A and Type B (which is perceivably 'fixed'). I’ve over-simplified his argument for brevity, and given it my own interpretation, which is that you can’t have both Type A and Type B. However, I contend that Type B time is just Type A time without consciousness, which resolves that particular paradox.

 

Most physicists, if not all, believe that the past, present and future are all fixed, because, according to Einstein’s special theory of relativity, ‘now’ is totally subjective. This is the so-called ‘block universe’, which is a logical consequence of treating time as a spatial dimension, giving us space-time.

 

You can observe time as a dimension by looking at the night sky and seeing stars hundreds, if not thousands of years, in the past. This means that hypothetical observers in different parts of the Universe see a different ‘now’ and will observe events occurring in different sequences. This is a logical consequence of the finite speed of light. However, causally related events must happen in an objective sequence, irrespective of observers. This is Type B time, as defined by McTaggart. We are able to deduce causality of events that have happened in our past, which gives us theories of cosmology and evolution. This has to be compatible with Type A time, which is dependent on the fact that we all live in the present all of the time. 

 

Whether our present is different to someone else’s present (somewhere else in the Universe) just means that their Type A experience of time is different to ours, but Type B time occurs regardless of conscious observers.


Wednesday 23 June 2021

Implications of the Mary’s Room thought experiment on AI

 This is a question I answered on Quora, mainly because I wanted to emphasise a point that no one discussed. 

This is a very good YouTube video that explains this thought experiment, its ramifications for consciousness and artificial intelligence, and its relevance to the limits of what we can know. I’m posting it here, because it provides a better description than I can, especially if you’re not familiar with it. It’s probably worth watching before you read the rest of this post (only 5 mins).




All the answers I saw on Quora, say it doesn’t prove anything because it’s a thought experiment, but even if it doesn’t ‘prove’ something, it emphasises an important point, which no one discusses, including the narrator in the video: colour is purely a psychological phenomenon. Colour can only exist in some creature’s mind, and, in fact, different species can see different colours that other species can’t see. You don’t need a thought experiment for this; it’s been demonstrated with animal behaviour experiments. Erwin Schrodinger in his lectures, Mind and Matter (compiled into his book, What is Life?), made the point that you can combine different frequencies of light (mix colours, in effect) to give the sensation of a colour that can also be created with one frequency. He points out that this does not happen with sound, otherwise we would not be able to listen to a symphony.

 

The point is that there are experiences in our minds that we can’t share with anyone else and that includes all conscious experiences (a point made in the video). So you could have an AI that can distinguish colours based on measuring the wavelength of reflected light, but it would never experience colours as we do. I believe this is the essence of the Mary's room thought experiment. If you replaced Mary with a computer that held all the same information about colour and how human brains work, it would never have an experience of colour, even if it could measure it.

 

I think the thought experiment demonstrates the difference between conscious experience and AI. I think the boundary will become harder to distinguish, which I explore in my own fiction, but I believe AI will always be a simulation – it won’t experience consciousness as we do.


Thursday 24 December 2020

Does imagination separate us from AI?

 I think this is a very good question, but it depends on how one defines ‘imagination’. I remember having a conversation (via email) with Peter Watson, who wrote an excellent book, A Terrible Beauty (about the minds and ideas of the 20th Century) which covered the arts and sciences with equal erudition, and very little of the politics and conflicts that we tend to associate with that century. In reference to the topic, he argued that imagination was a word past its use-by date, just like introspection and any other term that referred to an inner world. Effectively, he argued that because our inner world is completely dependent on our outer world, it’s misleading to use terms that suggest otherwise.

It’s an interesting perspective, not without merit, when you consider that we all speak and think in a language that is totally dependent on an external environment from our earliest years. 

 

But memory for us is not at all like memory in a computer, which provides a literal record of whatever it stores, including images, words and sounds. On the contrary, our memories of events are ‘reconstructions’, which tend to become less reliable over time. Curiously, the imagination apparently uses the same part of the brain as memory. I’m talking semantic memory, not muscle memory, which is completely different, physiologically. So the imagination, from the brain’s perspective is like a memory of the future. In other words, it’s a projection into the future of something we might desire or fear or just expect to happen. I believe that many animals have this same facility, which they demonstrate when they hunt or, alternatively, evade being hunted.

 

Raymond Tallis, who has a background in neuroscience and writes books as well as a regular column in Philosophy Now, had this to say, when talking about free will:

 

Free agents, then, are free because they select between imagined possibilities, and use actualities to bring about one rather than another.

 

I find a correspondence here with Richard Feynman’s ‘sum over histories’ interpretation of quantum mechanics (QM). There are, in fact, an infinite number of possible paths in the future, but only one is ‘actualised’ in the past.

 

But the key here is imagination. It is because we can imagine a future that we attempt to bring it about - that's free will. And what we imagine is affected by our past, our emotions and our intellectual considerations, but that doesn't make it predetermined.

 

Now, recent advances in AI would appear to do something similar in the form of making predictions based on recordings of past events. So what’s the difference? Well, if we’re playing a game of chess, there might not be a lot of difference, and AI has reached the stage where it can do it even better than humans. There are even computer programmes available now that try and predict what I’m going to write next, based on what I’ve already written. How do you know this hasn’t been written by a machine?

 

Computers use data – lots of it – and use it mindlessly, which means the computer really doesn’t know what it means in the same way we do. A computer can win a game of chess, but it requires a human watching the game to appreciate what it actually did. In the same way that a computer can distinguish one colour from another, including different shades of a single colour, but without ever ‘seeing’ a colour the way we do.

 

So, when we ‘imagine’, we fabricate a mindscape that affects us emotionally. The most obvious examples are in art, including music and stories. We now have computers also creating works of art, including music and stories. But here’s the thing: the computer cannot respond to these works of art the way we do.

 

Imagination is one of the fundamental attributes that makes us humans. An AI can and will (in the future) generate scenarios and select the one that produces the best outcome, given specific criteria. But, even in these situations, it is a tool that a human will use to analyse enormous amounts of data that would be beyond our capabilities. But I wouldn’t call it imagination any more than I would say an AI could see colour.


Friday 27 September 2019

Is the Universe conscious?

This is another question on Quora, and whilst it may seem trivial, even silly, I give it a serious answer.

Because it’s something we take for granted, literally every day of our lives, I find that many discussions on consciousness tend to gloss over its preternatural, epiphenomenal qualities (for want of a better description) and are often seemingly dismissive of its very existence. So let me be blunt: without consciousness, there is no reality. For you. At all.

My views are not orthodox, even heretical, but they are consistent with what I know and with the rest of my philosophy. The question has religious overtones, but I avoid all theological references.

This is the original question:

Is the universe all knowing/conscious?

And this is my answer:

I doubt it very much. If you read books about cosmology (The Book of Universes by John D Barrow, for example) you’ll appreciate how late consciousness arrived in the Universe. According to current estimates, it’s the last 520 million years of 13.8 billion, which is less than 4% of its age.

And as Barrow explains, the Universe needs to be of the mind-boggling scale we observe to allow enough time for complex life (like us) to evolve.

Consciousness is still a mystery, despite advances made in neuroscience. In the latest issue of New Scientist (21 Sep 2019) it’s the cover story: The True Nature of Consciousness; with the attached promise: We’re Finally Cracking the Greatest Mystery of You. But when you read the article the author (neuroscientist, Michael Graziano) seems to put faith in advances in AI achieving consciousness. It’s not the first time I’ve come across this optimism, yet I think it’s misguided. I don’t believe AI will ever become conscious, because it’s not supported by the evidence.

All the examples of consciousness that we know about are dependent on life. In other words, life evolved before consciousness did. With AI, people seem to think that the reverse will happen: a machine intelligence will become conscious and therefore it will be alive. It contradicts everything we have observed to date.

It’s based on the assumption that when a machine achieves a certain level of intelligence, it will automatically become conscious. Yet many animals of so-called lower intelligence (compared to humans) have consciousness and they don’t become more conscious if they become more intelligent. Computers can already beat humans at complex games and they improve all the time, but not one of them exhibits consciousness.

Slightly off-topic but relevant, because it demonstrates that consciousness is not dependent on just acquiring more machine intelligence.

I contend that consciousness is different to every other phenomena we know about, because it has a unique relationship with time. Erwin Schrodinger in his book, What is Life? made the observation that consciousness exists in a constant present. In other words, for a conscious observer, time is always ‘now’.

What’s more, I argue that it’s the only phenomena that does – everything else we observe becomes the past as soon as it happens - just take a photo to demonstrate.

This means that, without memory, you wouldn’t know you were conscious at all and there are situations where this has happened. People have been rendered unconscious, yet continue to behave as if they’re conscious, but later have no memory of it. I believe this is because their brain effectively stopped ‘recording’.

Consciousness occupies no space, even though it appears to be the consequence of material activity – specifically, the neurons in our brains. Because it appears to have a unique relationship with time and it can’t be directly measured, I’m not averse to the idea that it exists in another dimension. In mathematics, higher dimensions are not as aberrant as we perceive them, and I’ve read somewhere that neuron activity can be ‘modelled’ in a higher mathematical dimension. This idea is very speculative and I concede too fringe-thinking for most people.

As far as the Universe goes, I like to point out that reality (for us) requires both a physical world and consciousness - without consciousness there might as well be nothing. The Universe requires consciousness to be self-realised. This is a variant on the strong anthropic principle, originally expressed by Brandon Carter.

The weak anthropic principle says that only universes containing observers can be observed, which is a tautology. The strong anthropic principle effectively says that only universes, that allow conscious observers to emerge, can exist, which is my point about the Universe requiring consciousness to be self-realised. The Universe is not teleological (if you were to rerun the Universe, you’d get a different result) but the Universe has the necessary mathematical parameters to allow sentient life to emerge, which makes it quasi-teleological.

In answer to your question, I don’t think the Universe is conscious from its inception, but it has built into its long evolutionary development the inherent capacity to produce, not only conscious observers, but observers who can grasp the means to comprehend its workings and its origins, through mathematics and science.

Thursday 4 April 2019

Is time a psychological illusion or a parameter of the Universe?

I’ve recently read Paul Davies latest book, The Demon in the Machine (released in Feb) and I would highly recommend it.

We have reached a stage in politics and media generally that you are either for or against a person, an idea or an ideology. Anyone who studies philosophy in any depth realises that there are many points of view on a single topic. There are many voices that I admire yet there is not one that I completely agree with on everything they announce or proclaim or theorise about.

Paul Davies new book is a case in point. This book is very intellectually stimulating, even provocative, which is what I expect and is what makes it worth reading. Within its 200 plus pages, there was one short, well-written and erudite passage where I found myself in serious disagreement. It was his discussion on time and its relation to our perceptions.

He starts with Einstein’s well known quote: ‘The past, present and future is only a stubbornly persistent illusion.’ It’s important to put this into its proper context. Einstein wrote this in a letter to a mother of a friend who had recently died. It was written, of course, not only to console her, but to reveal his own conclusions arising from his theories of relativity and their inherent effect on time.

A consequence of Einstein’s theory was that simultaneity was dependent on the observer, so it was possible that 2 observers could disagree on the sequence of events occurring (depending on their respective frames of reference). Note that this is only true if there is no causal relationship between these events.

Also, Einstein believed in what’s now called a ‘block universe’ whereby the future is as fixed as the past. Some physicists still argue this, in the same way that some (if not many) argue that we live in a computer simulation (Davies, it should be pointed out, definitely does not).

I’m getting off the track, because what Davies argues is that the so-called ‘arrow of time’ is an ‘illusion’, as is the ‘flow of time’. He goes so far as to contentiously claim that time can’t be measured. His argument is simple: if time was to ‘slow down’ or ‘speed up’ everything, from your heart rate to atomic clocks would do so as well, so there is no way to perceive it or measure it. He argues that you can’t measure time against time: “It has to be ‘One second per second’ – a tautology!” However, as Davies well knows, Einstein’s theory of relativity tells us that you can measure the ‘rate of time’ of one clock against another, and this is done and allowed for in GPS calculations. See my post on the special theory of relativity where I describe this very phenomenon.

Davies argues that there is no ‘backwards or forwards in time’ and the arrow of time is a ‘misnomer’, a metaphor we use to describe a psychological phenomenon. According to him, it’s our persistent belief in a continuity of self that creates the illusion of ‘time passing’. But I think he has it back-to-front. (I’ll return to this later.)

So, if there is no direction of time and no flow of time, how do we describe it? Well, one way is to talk about whether phenomena are symmetrical or asymmetrical in time. In other words, if you were to reverse a sequence of events would you get back to where you started, or is that even possible? Davies argues that entropy or the second law of thermodynamics accounts for this perception. But here’s the thing: without time, motion would not exist and causation would not exist; both of which we witness all the time. And if time does not ‘pass’ or ‘flow’, then what does it do?

Mathematically, time is a dimension, which even has a smallest unit, called ‘Planck time’. Davies says it’s not measurable, but we do, even to the extent that we derive an age of the Universe. John Barrow, in his The Book of Universes, even provides an estimate in ‘Planck units’. Mathematically, we provide 4 co-ordinates for any event in the Universe – 3 of space and 1 of time. And, obviously, they can all change, but time is unique in that it appears to change continuously.*

And time is ‘fluid’ for want of a better word. Its ‘rate’ can change in gravity and relativistically because the speed of light is constant. The speed of light is the only thing that stops everything from happening at once, and for a photon, time is zero. A photon traverses the entire universe in zero time (from the photon’s perspective).

But for the rest of us, time is a constraint created by light. Everything you observe has already happened because it always takes a finite amount of time (from your perspective) for the photon to reach you and nothing can travel faster than light (because it travels in zero time). This is the paradox, but it’s the relationship between light and time that governs our understanding of the Universe. If something speeds up relative to something else (you), then the light it emits increases in frequency if it’s coming towards you and decreases if it’s moving away. Obviously, the very fact that you can measure its frequency means you can measure its velocity (relative to you), which is meaningless without the dimension of time.

So note that all observations (involving light) mean that everything you perceive is in the past – it’s impossible to see into the future. So the ‘arrow of time’, that Davies specifically calls a ‘misnomer’, is a pertinent description of this everyday perception – we can only observe time in one direction, which is the past.

Davies explains our perception of time as a neurological effect:

It is incontestable that we possess a very strong psychological impression that our awareness is being swept along on an unstoppable current of time, and it is perfectly legitimate to seek a scientific explanation for the feeling that time passes. The explanation of this familiar psychological flux is, in my view, to be found in neuroscience, not physics. (emphasis in the original.)

I’ve argued previously that perhaps it is only consciousness that exists in a constant present. It is certainly true that only consciousness can perceive time as a dynamic entity. Everything around us becomes instantly the past like we are standing in a river where we can’t see upstream. It is for this reason that the concepts of past, present and future are uniquely perceived by a conscious mind. Davies effectively argues that this is the sole representation of time: that ‘time passing’ only exists in our minds and not in reality. But if our minds exist in a constant present (relative to everything else) then time does pass us by; and past, present and future is not an illusion, but a consequence of consciousness interacting with reality.

There are causal events that occur around us all the time, but, like a photographic image, they become past events as soon as they happen. I believe there is a universal ‘now’, otherwise the idea of the age of the Universe makes no sense. But, possibly, only conscious entities ride this constant now, which is why everything else is dynamically going past us in a literal, not just a psychological, sense. This is where Davies and I disagree.

Meanwhile, the future exists in light beams yet to be seen. Quantum mechanically, a photon is a wave function (ψ) that’s in the future of whatever it interacts with. A photon is only observed in retrospect, along with its path, and that’s true for all quantum events, including the famous double slit experiment. As Freeman Dyson points out, QM gives us probabilities which are in the future. To paraphrase: ‘quantum mechanics describes the future and classical physics describes the past’. Most physicists (including Davies, I suspect) would disagree. The orthodox view is that classical physics is a special case of quantum mechanics and, in quantum cosmology, time mathematically disappears.

 Footnote: I should point out that Paul Davies is someone I’ve greatly admired and respected for many years.

*Paradoxically, at the event horizon of a black hole, time stops and we enter the world of quantum gravity. The evidence for black holes are accretion disks where the matter from a companion star forms a ring at the event horizon and emits high energy radiation as a result, which can be observed. However, from everything I've read, we need new physics to understand what happens beyond the event horizon of a black hole.