Read other letters about this article
It's controversial, but not crackpot.
"The chemical forces that control the interactions of atoms and molecules are indeed quantum mechanical in origin, and it is largely chemical action that governs the behaviour of neurotransmitter substances that transfer signals from one neuron to another - across tiny gaps that are called synaptic clefts. Likewise, the action potentials that physically control nerve-signal transmission have an admittedly quantum-mechanical origin."
"Shadows of the Mind", Roger Penrose pp 348