Richard Gregory knows more about the human brain than any man alive. This second edition of the Oxford Companion to the Mind has over 200 contributors, over a thousand entries and a million words and in it is much that is new since the first edition (1987.) Out goes Freud (well, not quite; he is still there, but much more strictly edited; ditto Jung et al.) and in comes a huge amount of new and riveting brain research. This is a philosophical and historical as well as a scientific work of immense learning that will divert and entertain as well as explain: it will expand your mind and change the physical structure of your brain. There are short pithy entries, sometimes delightfully quirky, often witty; there are longer, more complex contributions on a myriad of wide-ranging subjects, sometimes technical but always understandable, accessible even for the non-scientist reader. It ranges from mirror cells, face recognition, drama and how we see art to the hippocampus and Hobbes and shellshock. It covers language, memory, imagination and intelligence; the cocktail party effect, the halo effect and the least effort principle are all clearly explained. It contains three mini-symposia on consciousness, brain imaging and artificial intelligence. This is not just a dazzling reference book but also a diverting bed-side book for artist and scientist alike.