Unfortunately it appears that it is physically impossible for there to be a quantum computational aspect to the brain.
For a while I thought that perhaps the “conscious” (i.e. classical computer) part of the brain could act as the “observer” and by an “entangled Quantum Zeno effect” it could make the decoherence time of a brain quantum computer sufficiently long to be physically possible. The Quantum Computer part of the brain would correspond to the “sub-conscious”. Sadly, a discussion with perhaps the greatest theoretical Quantum Physicist on the planet shows that this is not viable 🙁 It therefore appears that there is NOT a quantum computational aspect to the brain.
And just today the bloody obvious hit me like a hammer. If there WAS a quantum computational aspect to the brain – then why would we be stymied by the 2-slit experiment? And more importantly why would Feynman have been able to say that “nobody understands Quantum Mechanics”?
Looks like the brain is a massively parallel classical computer, still it gives very impressive results!!