The evolution of nervous systems, from very simple ones to complex ones like ours, suggests that what we call “consciousness” is a matter of degree, emerging from the numbers of neurons involved and the combinatorics of their interconnections. I don’t see any more reason to attribute it to quantum effects in complex brains than in simpler brains. Quantum effects are involved in all physical phenomena at the smallest level, but they seem to become less significant at macroscopic levels, not more so. So I find it hard to believe that quantum effects would be more significant in explaining human consciousness than in explaining frog consciousness.