Douglas Richard Hofstadter (born February 15, 1945) is an American professor of cognitive science whose research focuses on the sense of "I" (sense of self in relation to the external world), consciousness, analogy-making, artistic creation, literary translation, and discovery in mathematics and physics. Hofstadter's book Gödel, Escher, Bach: An Eternal Golden Braid, first published in 1979, won both the Pulitzer Prize for general non-fiction and a National Book Award (at that time called The American Book Award) for Science. His 2007 book I Am a Strange Loop won the Los Angeles Times Book Prize for Science and Technology
On The Nature of Categories and Concepts
In this talk Hofstadter examines our methods of catigorization and the paradoxes that exist in those methods. What is a quintessential category? Bird, perhaps? Or maybe chair? And what is a quintessential concept? Two? Number? Prime number? "A category is a set of objects out there in the real world, whereas a concept is a mental entity that gets activated whenever one sees a member of the corresponding category"?