that's actually different from saying the brain is a computer. That's the metaphor I think is inaccurate.
Oh, that's easy it's anything that is mathematically shown to be computationally the same as a Turing machine: https://en.wikipedia.org/wiki/Turing_machine …
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bearing in mind that Turing defined Turing machine based on what women's brains could do in Bletchley park.
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So the definition of computer is: anything a brain can compute and he did defined it formally using maths. Many other computational systems
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are subsets of what a Universal Turing Machine can do. But anything a Turing machine can do, a brain can do, by definition.
End of conversation
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