There is no independent "mind", these two practically say, just the human brain, three pounds of tissue and water, firing away behind all our emotions, beliefs, actions. Consciousness itself, they say, is straight biology, a machine.
Once, that sounded esoteric. Now, it's on the frontline of debate over law, soul and life.
This hour On Point: Pat and Paul Churchland on the mind as science.
Paul and Patricia Churchland, professors of philosophy at the University of California at San Diego.
Colin McGinn, professor of philosophy at the University of Miami.
This program aired on March 12, 2007.