is there a pointer to more discussion somewhere for those of us not in the know? thx!
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Also to be completely correct and historical it is COGNTIVE scientists not neuro-anythings that think the mind the computes. Neuro-people
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have been slowly becoming more cognitive though, e.g., cog neurosci. But then again cogsci people have been becoming less cog, which is very
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disappointing — although not directly relevant. Regardless, the ppl who tend to have a problem with this metaphor have various disagreements
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with the terminology but even they generally would accept that e.g. ML techniques do vision like the brain does vision.
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If only more ppl understood this! So much ink spilled due to mistaken equating of computing with von Neuman machines...
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Example of a computing that is not von Neuman?
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Neural networks. von Neuman machines are a specific implementation of TMs, but not all TMs are von Neuman machines.
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Neural networks clearly computational. They are made of elements that do arithmetic!
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Yes, but they don’t do it with serial processing via nand gates and addressable memory, which is what von Neuman machines do.
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IMO an interesting argument begins there. Why is the brain not a kidney or a heart? (5)
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This is interesting, but I other organs do some simple computation (e.g. maintain homeostasis fn). Brain is more powerful computer, though.
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Thermostats maintain homeostasis. Chalmers has suggested they have consciousness. IMO wrong.
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We know so little about neural algorithms. Not known what a column of cortex does. Discussion premature.
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Disagree.
@o_guest point is dead on. Computing is very general, details of brain’s algorithms need not be known to assert brain computes. -
You can model the trajectory of a thrown rock with a computer; doesn’t mean the rock is a computer.
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True, but that’s because the rock doesn’t meet definition of computation by TM. As o_guest suggested, Church-Turing hypothesis is key.
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Evidence that the brain does this, but the rock or the kidney doesn’t?
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Can you tell me what 1 + 1 equals? Can you compute XOR? Can you sort a list? Can a rock do any of this?
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Can neurons? Neurons can’t even do conjunctive logic? Not easy (I tried, and failed, in a model)
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Neurons can in a network. You can train a rat to do XOR, for example.
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