Aimed at philsophy graduates this book investigates mental content in a systematic way and advances a number of claims about how mental content states are related to the body and the world. Internalism is the thesis that they are; externalism is the theory that they are not.

Colin McGinn was educated at Oxford University. The author of sixteen previous books, including The Making of a Philosopher, he has written for the London Review of Books, The New Republic, the New York Times Book Review, and other publications. He has taught philosophy at University College of London, Oxford, and Rutgers University, and is a distinguished professor of philosophy at the University of Miami.