Explaining how the brain works may never explain why anything feels like anything

Philosopher David Chalmers split the puzzle of consciousness into 'easy problems', explaining how the brain processes information and controls behavior, and the 'hard problem': explaining why any of that processing comes with subjective experience at all. Even a complete map of every neuron firing, he argued, wouldn't explain why there's something it feels like to see red rather than nothing. The gap between physical description and felt experience remains unresolved in philosophy of mind.

— David Chalmers, Facing Up to the Problem of Consciousness — Journal of Consciousness Studies, 1995