How does a pattern of brain activity generate feeling? This is not a question about how that pattern of brain activity is generated, for that can be explained in the usual way, just as we explain how a pattern of activity in a car is or a kidney is generated. It is a question about how feeling itself is generated. Otherwise the feeling just remains something that is mysteriously (but reliably) correlated with certain brain patterns.

We don't know how brain activity could generate feeling. Even less do we know why.

Stevan Harnad, "Letters: What is Consciousness?" in the June 23, 2005 NYRB.