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kmoser 13 hours ago

> Professor Searle concluded that psychological states could never be attributed to computer programs, and that it was wrong to compare the brain to hardware or the mind to software.

Gotta agree here. The brain is a chemical computer with a gazillion inputs that are stimulated in manifold ways by the world around it, and is constantly changing states while you are alive; a computer is a digital processor that works work with raw data, and tends to be entirely static when no processing is happening. The two are vastly different entities that are similar in only the most abstract ways.

levocardia 12 hours ago | parent | next [-]

Searle had an even stronger version of that belief, though: he believed that a full computational simulation of all of those gazillion inputs, being stimulated in all those manifold ways, would still not be conscious and not have a 'mind' in the human sense. The NYT obituary quotes him comparing a computer simulation of a building fire against the actual building going up in flames.

block_dagger 12 hours ago | parent | next [-]

When I read that analogy, I found it inept. Fire is a well defined physical process. Understanding / cognition is not necessarily physical and certainly not well defined.

sgt101 7 hours ago | parent | next [-]

>Understanding / cognition is not necessarily physical and certainly not well defined.

Whooha! If it's not physical what is it? How does something that's not physical interact with the universe and how does the universe interact with it? Where does the energy come from and go? Why would that process not be a physical process like any other?

lxgr 5 hours ago | parent | prev | next [-]

I'd say understanding and cognition are at this point fully explainable mechanistically. (I am very excited to live in a time where I was able to change my mind on this!)

Where we haven't made any headway on is on the connection between that and subjective experience/qualia. I feel like much of the (in my mind) strange conclusions of the Chinese Room are about that and not really about "pure" cognition.

visarga 11 hours ago | parent | prev | next [-]

Simulated fire would burn down simulated building

measurablefunc 9 hours ago | parent [-]

If everything is simulated then "simulated(x)" is a vacuous predicate & tells you nothing so you might as well throw it away & speak directly in terms of the objects instead of wrapping/prepending everything w/ "simulated".

pwdisswordfishy 6 hours ago | parent [-]

"Simulated" is not a predicate, but a modality.

lo_zamoyski 11 hours ago | parent | prev | next [-]

That's debatable, but it is also irrelevant, as the key to the argument here is that computation is by definition an abstract and strictly syntactic construct - one that has no objective reality vis-a-vis the physical devices we use to simulate computation and call "computers" - while semantics or intentionality are essential to human intelligence. And no amount of syntax can somehow magically transmute into semantics.

vidarh 5 hours ago | parent [-]

This makes no sense. You could equally make the statement that thought is by definition an abstract and strictly syntactic construct - one that has no objective reality. Neither statement is supported by anything.

There's also no "magic" involved in transmuting syntax into semantics, merely a subjective observer applying semantics to it.

netdevphoenix 2 hours ago | parent | prev | next [-]

Do you believe that there are things that are not physical? Extraordinary claims require extraordinary evidence. And no, "science can't explain x hence metaphysical" is not a valid response.

voidhorse 12 hours ago | parent | prev | next [-]

But that acknowledgement would itself lend Searle's argument credence because much of the brain = computer thesis depends on a fundamental premise that both brains and digital computers realize computation under the same physical constraints; the "physical substrate" doesn't matter (and that there is necessarily nothing special about biophysical systems beyond computational or resource complexity) (the same thinking by the way, leads to arguments that an abacus and a computer are essentially "the same"—really at root these are all fallacies of unwarranted/extremist abstraction/reductionism)

The history of the brain computer equation idea is fascinating and incredibly shaky. Basically a couple of cyberneticists posed a brain = computer analogy back in the 50s with wildly little justification and everyone just ran with it anyway and very few people (Searle is one of those few) have actually challenged it.

vidarh 5 hours ago | parent | next [-]

Unless you can show an example of how we can compute something that is not Turing computable, there is no justification for the inverse, as the inverse would require something in the brain to be capable of interactions that can not be simulated. And we've no evidence to suggest either that the brain can do something not Turing computable or of the presence of something in the brain that can't be simulated.

ozy 7 hours ago | parent | prev | next [-]

Maybe consciousness is exactly like simulated fire. It does a lot inside the simulation, but is nothing on the outside.

lo_zamoyski 11 hours ago | parent | prev | next [-]

> The history of the brain computer equation idea is fascinating and incredibly shaky. Basically a couple of cyberneticists posed a brain = computer analogy back in the 50s with wildly little justification and everyone just ran with it anyway and very few people (Searle is one of those few) have actually challenged it.

And something that often happens whenever some phenomenon falls under scientific investigation, like mechanical force or hydraulics or electricity or quantum mechanics or whatever.

jacquesm 9 hours ago | parent | prev [-]

Roger Penrose would be another.

freejazz 11 hours ago | parent | prev [-]

Isn't that besides the point? The point is that something would actually burn down.

wzdd 11 hours ago | parent | next [-]

GP's point is that buring something down is by definition something that requires a specific physical process. It's not obvious that thinking is the same. So when someone says something like "just as a simulation of fire isn't the same as an actual fire (in a very important way!), a simulation of thinking isn't the same as actual thinking" they're arguing circularly, having already accepted their conclusion that both acts necessarily require a specific physical process. Daniel Dennett called this sort of argument an "intuition pump", which relies on a misleading but intuitive analogy to get you to accept an otherwise-difficult-to-prove conclusion.

To be fair to Searle, I don't think he advanced this as an agument, but more of an illustration of his belief that thinking was indeed a physical process specific to brains.

measurablefunc 9 hours ago | parent [-]

He explains it in the original paper¹ & says in no uncertain terms that he believes the brain is a machine & minds are implementable on machines. What he is actually arguing is that substrate independent digital computation will never be a sufficient explanation for conscious experience. He says that brains are proof that consciousness is physical & mechanical but not digital. Searle is not against the computationalist hypothesis of minds, he admits that there is nothing special about minds in terms of physical processes but he doesn't reduce everything to substrate independent digital computation & conclude that minds are just software running on brains. There are a bunch of subtle distinctions that people miss when they try to refute Searle's argument.

¹https://home.csulb.edu/~cwallis/382/readings/482/searle.mind...

Zarathruster 7 hours ago | parent [-]

Quick definitional help for anyone who clicks on your link: the term "intentionality" in this context has a specialized meaning. In reference to mental states, it's the property of being about something, as in, "Alice is thinking about Bob." It doesn't necessarily have anything to do with intent, per se.

https://plato.stanford.edu/entries/consciousness-intentional...

anigbrowl 11 hours ago | parent | prev [-]

https://home.sandiego.edu/~baber/analytic/Lem1979.html

12 hours ago | parent | prev [-]
[deleted]
vidarh 5 hours ago | parent | prev | next [-]

Unless human brains exceeds the Turing computable, they're still computationally equivalent, and we have no indication exceeding the Turing computable is even possible.

cannonpr 12 hours ago | parent | prev | next [-]

I think the statement above and yours both seem to ignore “Turing complete” systems, which would indicate that a computer is entirely capable of simulating the brain, perhaps not before the heat death of the universe, that’s yet to be proven and depends a lot on what the brain is really doing underneath in terms of crunching.

voidhorse 11 hours ago | parent [-]

This depends on the assumption that all brain activity is the process of realizing computable functions. I'm not really aware of any strong philosophical or neurological positions that has established this beyond dispute. Not to resurrect vitalism or something but we'd first need to establish that biological systems are reducible to strictly physical systems. Even so, I think there's some reason to think that the highly complex social historical process of human development might complicate things a bit more than just brute force "simulate enough neurons". Worse, whose brain exactly do you simulate? We are all different. How do we determine which minute differences in neural architecture matter?

lo_zamoyski 10 hours ago | parent [-]

> we'd first need to establish that biological systems are reducible to strictly physical systems.

Or even more fundamentally, that physics captures all physical phenomena, which it doesn't. The methods of physics intentionally ignore certain aspects of reality and focus on quantifiable and structural aspects while also drawing on layers of abstractions where it is easy to mistakenly attribute features of these abstractions to reality.

sgt101 7 hours ago | parent | next [-]

>also drawing on layers of abstractions where it is easy to mistakenly attribute features of these abstractions to reality.

Ok - I get that bit. I have always thought that physics is a description of the universe as observed and of course the description could be misleading in some way.

>the methods of physics intentionally ignore certain aspects of reality and focus on quantifiable and structural aspects

Can you share the aspects of reality that physics ignores? What parts of reality are unquantifiable and not structural?

lo_zamoyski 3 minutes ago | parent [-]

> Can you share the aspects of reality that physics ignores?

Here's an article you might enjoy [0].

[0] http://edwardfeser.blogspot.com/2022/05/the-hollow-universe-...

Thiez 3 hours ago | parent | prev [-]

Not all of physics is relevant to a brain simulation. For example, humans appear equally conscious in free fall or in an accelerating vehicle, so a simulation can probably safely ignore the effects of gravity without affecting the outcome. We also know that at body temperature (so about 310K) there is a lot of noise, so we can rule out subtle quantum effects. There is also noise from head movement, pressure changes due to blood flow, slight changes in the chemicals present (homeostasis is not perfect). We won't be simulating at the level of individual molecules or lower.

To me it seems highly likely that our knowledge of physics is more than sufficient for simulating the brain, what is lacking is knowledge of biology and the computational power.

lxgr 5 hours ago | parent | prev | next [-]

That's a quantitative distinction at most, since computationally both are equivalent (as both can simulate each other's basic components).

And what's a few orders of magnitudes in implementation efficiency among philosophers?

anigbrowl 11 hours ago | parent | prev | next [-]

a computer is a digital processor that works work with raw data, and tends to be entirely static when no processing is happening.

This depends entirely on how it's configured. Right now we've chosen to set up LLMs as verbally acute Skinner boxes, but there's not reason you can't set up a computer system to be processing input or doing self-maintenance (ie sleep) all the time.

p1esk 11 hours ago | parent | prev | next [-]

So you’re saying a brain is a computer, right?

kmoser 9 hours ago | parent [-]

In the sense that it can perform computations, yes. But the underlying mechanisms are vastly different from a modern digital computer, making them extremely different devices that are alike in only a vague sense.

sgt101 7 hours ago | parent [-]

I have always wondered if we would be capable of writing down the mechanisms that power our thoughts. I think that this was one of the ideas that bubbled up from reading Godel Escher Bach many years ago. Is it possible for us to express the machine that makes us using the outputs of that machine in the way that it's not possible to write second order logic using first order logic.

Of course, also there are processes that are not expressible as computations, but those of these that I know about seem very very distant from human thought, and it seems very very improbable that they could be implemented with a brain. I also think that these are not observed in our universe so far.

DaveZale 12 hours ago | parent | prev [-]

Yes. I took an introneuroscience course a few years ago. Even to understand what is happening in one neuron during one input from one dendrite requires differential equations. And there are postive and negative inputs and modulations... it is bewildering! And how many billions of neurons with hundreds of interactions with surrounding neurons? And bundles of them, many still unknown?

p1esk 11 hours ago | parent | next [-]

Do you need differential equations to understand what’s happening in a transistor?

throwaway78940 11 hours ago | parent | prev [-]

Searle was known for the Chinese Room experiment, whicb demonstrated language in its translational states to be strong enclitic feature of various judgements of the intermediary.

subjectivationx an hour ago | parent | next [-]

Searle also has almost 20 books, most written after 1980 and the Chinese room. None that I have read are pop science NYT best seller types. I suspect that is why most people only know the Chinese room. His depth of thought was much more than the Chinese Room.

sgt101 7 hours ago | parent | prev [-]

>translational states to be strong enclitic feature of various judgements of the intermediary

I don't understand, could you explain what you mean?

I looked up enclitic - it seems to mean the shortening of a word by emphasizing another word, I can't understand why this would apply to the judgements of an intermediary