It's definitely not arbitrary. We have solid mathematical definitions of computing that are not tied to any particular implementation.
Saying "the brain is not a computer" is a shorthand for "the brain is not Turing equivalent".
Now, that could be true. But if it is, it would be the first time anybody has found a physical system in our universe that can't be simulated by a Turing machine. It seems like quite a stretch.
Saying "the brain is not a computer" is a shorthand for "the brain is not Turing equivalent".
Now, that could be true. But if it is, it would be the first time anybody has found a physical system in our universe that can't be simulated by a Turing machine. It seems like quite a stretch.