Consciousness arises from brain activity. If the latter is altered by psychotropic drugs or by disease, the former is immediately affected. And yet, the two phenomena seem to belong to completely different dimensions.
How can we explain that all the richness of our inner life, starting with the simple subjective experience of seeing a blue sky or smelling the aroma of coffee, can result from neurochemical activity in the brain, which contains neither colour nor odour?
This is the apparent mystery of consciousness that is at the heart of this interview.