String theorist Edward Witten says consciousness “will remain a mystery”
blogs.scientificamerican.com
blogs.scientificamerican.com
However, I think there are a lot less fuzzy questions that are strongly connected with consciousness that I'm hoping can be find answers for - and that could shed some more light on what consciousness is and what it isn't. Such as:
- what are memories? Could we build some machine to extract or even manipulate them? Is it possible to compare memories of different people?
- what are dreams?
- different parts of our body are affected differently by our consciousness: Some things we can control directly, like hands, feet, speech, etc; some processes we cannot control but we do experience them, such as hunger or sleep; and some we neither control nor experience such as digestion, homeostasis etc, even though they are also regulated by the brain. Even more couriously, many of those autonomous processes are greatly affected by conscious thoughts even though we don't experience them as directly controllable - such as fear and arousal. Inversely, conscious actions often have autonomous "sub routines", such as walking. So what what mechanism in the brain governs which processes are conscious and which are not?
- Suppose we could actually do brain transplants. Assume we put an adult human brain in a jar and connect it with some kind of VR. Could the brain learn to control a non-human body such as a spider? How about a human body with different proportions?
https://en.m.wikipedia.org/wiki/Hard_problem_of_consciousnes...
https://en.wikipedia.org/wiki/Knowledge_argument
http://philosophyfaculty.ucsd.edu/faculty/rarneson/Courses/F...
> The end of science really is the end of the search for final causation.
Causation is everything. It governs from individual choice to the speed of light. Visualizations are internal perceptions that mimic the effect of light on our awareness. Where do those come from and is causality respected in them? Answer that, and you answer the consciousness question.
> But I think there probably will remain a level of mystery regarding why the brain is functioning in the ways that we can see it, why it creates consciousness or whatever you want to call it. How it functions in the way a conscious human being functions will become clear. But what it is we are experiencing when we are experiencing consciousness, I see as remaining a mystery...
Understanding the difference between __workings__ and experience of consciousness, the hard problem of consciousness [1], is crucial for understanding what Witten says. Witten says that while science will figure out how mind works in great detail the hard problem of consciousness remains outside science.
It's easy to be sympathetic to Witten. The problem with consciousness seems to be with intuitive meaning of a word and concept.
Imagine that someone builds small programs -- or really small brains in a vat -- that are conscious of color blue, or feel universal love and nothing else. Program's attention and awareness never goes elsewhere and it performs no other cognitive tasks than being conscious in the moment without long term memory. Can you imagine scientists going trough the __workings__ -- code, neuron diagrams or state representations -- of it's mind and going, oh this thing clearly conscious, we can see it now and agree.
There seems to be assumption that the hard problem of consciousness is tied to multiple high level cognitive capabilities. I don't see the connection. The crux of being conscious is having the cognitive ability of aware-consiouns-attentative-reflective at least tiny amount of time. If we could scientifically determine what consciousness is, we should be able to make nice hyper-aware-of-blue-and-knowing-it program and it would be relatively simple one.
[1]: http://www.scholarpedia.org/article/Hard_problem_of_consciou...
Me too. Sometimes one informs or inspires the other, but so far it seems that is about it.
Deep Mind has stated that their purpose this year is to build a rat level AI (https://www.youtube.com/watch?v=MAMuNUixKJ8). That would entail rat-level consciousness too.
I mean, the way neural nets behave in computer vision implies some form of attention. On some benchmarks neurons and deep learning have almost the same biological output (poorly phrased, was from a talk that NG gave). Perceiving, or parts of perception have something to do with consciousness. Attention has something to do with consciousness.
And you don't have to agree on everything I say, I'm typing/thinking quickly. My point is: machine learning has at least something to do with consciousness.
Neural nets are loosely inspired from the brain (and a ton of math). So it could perhaps nuance certain neuroscientific findigs in some cases or the other way around (e.g., neural net designs for the visual system or other brain systems). Anyways, that's how I get the connection.
A stone brick and consciousness, that has nothing to do with each other, nothing practical/inspirational anyway.
On a personal note I have never been very impressed with arguments over the importance of consciousness. I have had too many experiences in life where consciousness is grey to feel it is anything other than a just-so story of what happened.
Personally I'd leave it to the philosophy guys since we're that far from any understanding of it.
But it feels more sparkly and special to treat it as a mystery.
...Which would be a subjective experience that seems to have curiously objective elements to it, because colours have been shown to correlate with specific sensations and associations across populations.
And then there's the much deeper question of the extent to which quantum phenomena need an objective observer.
If you think that question is trivial, try to design an experiment which provides objective evidence of change without ultimately relying on the subjective experience of a human experimenter.
Your subjectivity is your brain is you. But only tiny scraps of it are consciously accessible. Nearly all of it just does, it doesn't reflect on the doing. You only notice your visual processing when you force it to glitch or strain with optical illusions and the like.
But as soon as we solve some fraction of the problem with scientific means, a small fragment remains to be probed further, still mysterious. Solve that and a yet smaller facet still remains, as in Zeno's paradox. That has been the case with AI, with simulations and physics models and medicine and most fields of study.
Our notion of the authentic is always on fragile ground, and this is most easily seen in music, where technology has enabled total control of the sound on a theoretical level of adding harmonics, but not in the practical sense of "reproduce this sound but make it Better". At the extreme ends it becomes a matter of taste again - why else should vinyl or vacuum tubes or analog filters remain so cherished? As we gain more technology, more of our lives enters this limbo where science can provide deductions that identify and change the measurable, but do not tell us how to pick good measures for ourselves. Philosophizing it is just a matter of continuing to ask those kinds of hard questions and inching forward ever so slightly each time.
When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
"Just because Witten is a genius does not mean he is infallible. He is wrong, I believe, that string theory will eventually be validated,..."
The simulation hypothesis does not make such dualistic arguments.
https://www.amazon.com/Consciousness-Social-Brain-Michael-Gr...
An article by the same author:
http://www.theatlantic.com/science/archive/2016/03/phlegm-th...
The question is, which laws of physics, and are the interaction between those laws of physics, interactions we already know, or new ones we have not discovered yet?
Otherwise we might as well say consciousness follows the will of God.
Why? The engineering definition of deterministic implies predictable outcomes given a known internal state. Are you suggesting that we're already at the level where we can accurately and fully measure a human brain's internal state?
That does not mean that we cannot discuss the likelihood of each explanation, keeping in mind that both explanations could be incorrect. We have Drake's Equation even though, for all we know, nobody has ever seen an extraterrestrial life-form. We have flight because nature demonstrated flight to us: nature continuously demonstrates the capability to evolve quantum machines (e.g. the nose and various other organic processes[1]).
Finally, the engineering definition of determinism is not the only definition.[2]
[1]: http://www.bbc.com/earth/story/20160715-organisms-might-be-q... [2]: https://en.wikipedia.org/wiki/Deterministic_system_(philosop...
To whom is it an illusion? And, what are the properties of this illusion? Can we make artificial minds that are also suffering from the same illusion?
The very fact that there is (let's suppose) such an illusion requires an explanation. Suppose the brain has somewhere encoded the idea of consciousness, but no "actual" consciousness. Why do we require the extra step of "actual" consciousness rather than mere "illusory" consciousness?
Of course the real explanation of consciousness will be both profound (beautiful, unexpected) and mundane (non supernatural).
The expectation of something does not guarantee its existence. Words are created to define the expectation of something unexplained, only to be discarded when the expectation is unmet.
Take the word "miasma". At some point in history, a belief was born that all diseases came from gaseous poisons emitted by rot. Then the miasma theory got definitely discarded when we got the ability to view germs, which are simply distant cousins. https://en.wikipedia.org/wiki/Miasma_theory
Take the word "aether". Since waves on the sea were carried by water and sound waves by air, it was assumed that interplanetary space was filled with a substance that light (assumed to be just a wave back then) was carried through. It was called aether. It turns out the real explanation of aether is not profound nor mundane: there is nothing, and that nothing expands. https://en.wikipedia.org/wiki/Aether_theories
I don't really understand why it is hard to accept that there is no after-life, that all our activities are the sole result of chemical transmission of signals in our brains... that there is no point of view, just local chemical storage of information.
But it was hard for our ancestors to fathom that humans were part of a phylogenetic tree encompassing all Earth life forms, that we as a species were not special. It was hard for them to fathom that space is relative, that there is no center. I suppose it is always hard to accept that there is no reference point in the universe.
You have just restated the problem of consciousness, except as an assertion that it doesn't exist.
The problem of reductionism is that it doesn't stop; just as there aren't really points of view, there aren't really any chemicals, and there isn't really such a thing as (classical, let's say) information. All of these things are "just" emergent phenomena.
The explanations which made "aether" and "miasma" obsolete are beautiful, unexpected at the time (in a trivial sense), and of course, not supernatural.
I agree with you about the afterlife. However consider this: if the universe is infinite, isn't it likely that there will be copies of you which arise spontaneously, in all conceivable circumstances? The older you get, the less likely you are to be in a place or time that is causally connected to your birth, because most causal chains involve your death. (This is just a specific case of a Boltzmann Brain[1])
Of course, this sort of nonsense thought experiment runs afoul of the Measure Problem [2]. But this is precisely the kind of problem that I hope the explanation of consciousness would help to resolve.
[1] https://en.wikipedia.org/wiki/Boltzmann_brain
[2] https://en.wikipedia.org/wiki/Measure_problem_(cosmology)
Things that don't exist are rarely problematic. But in fairness, I cannot guarantee that there is no consciousness, just as I cannot guarantee that gravity exists — it could be part of a simulation in which I was put since birth, and the real world could have very different laws of physics. Nothing new here, it is Occam's razor.
> it doesn't stop; just as there aren't really points of view, there aren't really any chemicals, and there isn't really such a thing as (classical, let's say) information.
There is such a thing as a point of view. I object to the notion of consciousness solely because of how it is used. Plants have points of view too; jellyfish do too, without the need for a brain. They react intelligently to their environment. Are those conscious? It is clearer to talk about "brains" and "points of view" than it is to talk about "consciousness".
> The explanations which made "aether" and "miasma" obsolete are beautiful, unexpected at the time (in a trivial sense), and of course, not supernatural.
I suppose that's up to each of us to judge. I don't find the idea that throughout my body, millions of tiny unicellular parasites are having a snack, particularly beautiful. Similarly, the idea that there is an invisible energy pulling everything apart always felt supernatural to me.
> if the universe is infinite, isn't it likely that there will be copies of you
The probability is above zero, but given that space is overwhelmingly empty, and given how much information defines my identity (including my average DNA, which is inherited from millions of years of evolution in extremely specific circumstances), it seems unlikely. If there is a copy of me in the universe, the most probable location would be on Earth, extremely close to where I sit.
For example, you could find out that consciousness is a real phenomenon but that it's experienced by more matter than we think, but without as much depth or ability to express itself as the human neocortex. Or perhaps each of us has multiple consciousnesses within, but we can't sense it because they all share the same memories and have essentially the same desires and feelings. Who knows! But it could be substantially different than how we frame a singular, soul-like consciousness
You're not far from the truth. Every piece of your brain still alive works roughly as the whole, even when cut off from the rest. Every part of it can make complex decisions (although past a certain size, it's not going to be very smart).
See experiments on a patient with a severed corpus callosum: https://www.youtube.com/watch?v=zx53Zj7EKQE
Would be happy if someone more knowledgeable could elaborate.
And we aren't made of anything other than what all the animals are made of, and the underlying processes in our brains aren't physically unique. And there's no "spirit" or "soul" needed to explain anything.
The word spirit comes from Latin spiritus "breath." Ditto for the term for soul "psyche" which comes from the ancient Greek psykhe with the original meaning "breath." That's all that "leaves us" when we die (as we "have our last breath") and from where all the magical thinking came.
The consciousness is just a product of evolution, and "a kind of self awareness" exists by animals too. Not much different from what we observe by ourselves, and actually of direct evolutionary advantage.
More about all that:
http://www.vice.com/read/sorry-religions-human-consciousness...
http://www.livescience.com/26338-crabs-feel-pain.html
http://backreaction.blogspot.com/2016/01/free-will-is-dead-l...
https://en.wikipedia.org/wiki/The_Demon-Haunted_World
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1) if themselves not explicitly declared believers or at least philosophers, the latter having all the incentives to mystify the topic and stay away from the hard sciences
2) 4 of 10 in the US believe "that God created humans in their present form 10,000 years ago: http://www.gallup.com/poll/170822/believe-creationist-view-h...
Exactly. Nothing makes sense in biology except in the light of evolution ( https://en.wikipedia.org/wiki/Nothing_in_Biology_Makes_Sense... ).
Why do some digger wasps only count their own contribution to a nest ( https://www.researchgate.net/publication/245965580_Do_Digger... ), and why do some perform redundant nest-checking ( https://en.wikipedia.org/wiki/Sphex#Uses_in_philosophy )?
For the same reason we don't calculate exact solutions to large travelling salesman problems; it's much more economical and evolutionarily advantageous to use heuristics, even if they have quirky side-effects and edge-cases.
If you wade your way through it, you'll find the tl;dr is 'consciousness must be a quantum thing because quantum things are mysterious and so is consciousness- oh and look at those microtubules in those neurons - you might get quantum effects in there.'
Rather disappointing for such a brilliant man.
There are two problems with this line of reasoning. The first problem is that 2) is unsubstantiated. A human can see immediately that 15 = 3 x 5, but this doesn't mean that we have a magical ability to factor integers instantly. By the frivolous theorem of arithmetic, almost all natural numbers are very, very, very large. We have some ability to analyze formal systems, but the systems we have managed to understand are very simple in the grand scheme of things. Almost all formal systems are very, very, very complex, and there is no evidence that we can understand them all and/or that our understanding process actually is correct (consistent) when extended indefinitely. Penrose's actual argument is of course more technical, and others have made more precise rebuttals.
The second problem is that the argument does not solve the problem of consciousness. Scott Aaronson put it nicely: "Even if we supposed the brain was solving a hard computational problem, it's not clear why that would bring us any closer to understanding consciousness. If it doesn't feel like anything to be a Turing machine, then why does it feel like something to be a Turing machine with an oracle for the halting problem?"
It's also an idea that few philosophers of mind agree with at this point. Gilbert Ryle did a pretty good job of showing that the mind-body problem is a pseudo-problem [0].
[0] https://www.amazon.com/Concept-Mind-Gilbert-Ryle/dp/02267329...
Have you read Gilbert Ryle's "The Concept of Mind" (1949) [0]?
This is a very old and tired argument. The form you seem to be endorsing has fallen out of favor in philosophy circles. For an intuitive understanding of why interactionist dualism is a bad explanation of phenomenology, consider the following problems:
- How does your non-physical substance (what you call a fundamental force in the universe) interact with a physical "antenna"?
- Given that this force interacts with matter (as evidenced by consciousness disappearing after certain brain injuries), how is it that it evades physical measure by scientific instruments?