In the third Reith Lecture from his series 'Minds, Brains and Science', John Searle, Professor of Philosophy at the University of California, Berkeley, explores the discipline of cognitive science.

In this lecture entitled 'Grandmother Knew Best', Professor John Searle investigates how and why scientists are developing the field of cognitive science. Exploring how the human brain processes information in order to do the action of thinking, John Searle links back to his previous lectures to debate the differences between human thought and computerised artificial intelligence.