IMO, this is like asking at what point a digital signal becomes analog.
Some will say never even if it gets indistinguishable because at its core, a digital signal is still discrete.
Another point is we scarcely know how the brain works. Evolution has taught us how good it is at using obscure and barely noticeable principles and logics to achieve a goal. For all we know, the brain might depend on a completely unknown type of interaction between unknown subatomic particles using unknown physics.
Quantum biology is a thing and 50 years ago, it would not even be conceivable that there are controllable quantum processes happening in a living system.
Some will say never even if it gets indistinguishable because at its core, a digital signal is still discrete.
Another point is we scarcely know how the brain works. Evolution has taught us how good it is at using obscure and barely noticeable principles and logics to achieve a goal. For all we know, the brain might depend on a completely unknown type of interaction between unknown subatomic particles using unknown physics.
Quantum biology is a thing and 50 years ago, it would not even be conceivable that there are controllable quantum processes happening in a living system.