Recent proposals in quantum gravity have suggested that unknown systems can mediate entanglement between two known quantum systems, if and only if the mediator itself is non-classical. This approach may be applicable to the brain, where speculations about quantum operations in consciousness and cognition have a long history.
The Quantum brain (QB) question.Thanks to the so-called Copenhagen interpretation, quantum mechanics has been connected with consciousness since its early days. The group around Niels Bohr suggested that an observer is an essential part of quantum mechanics. Schrodinger's cat was an attempt to questioning that idea, not to explain it. Although many alternative interpretation have been proposed...