Not quantum

Quantum computers are Turing-equivalent, so even if the brain was a quantum computer, all of its algorithms would still be computable on classical computers.

The brain is almost certainly not a quantum computer.1

So the brain’s algorithms will run on classical computers without exponential slowdown.*Be skeptical!

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  1. Litt, A., Eliasmith, C., Kroon, F.W., Weinstein, S. and Thagard, P. (2006), Is the Brain a Quantum Computer?. Cognitive Science, 30: 593-603 ↩︎