Specialist books : What is thought?

Edited by Peter Millican and Andy Clark, these two volumes, Machines and
Thought: The Legacy of Alan Turing (Oxford University Press,
£30/£30, ISBN 0 19 823593 3/0 19 823594 1) celebrate Turing’s famous
paper, published forty years ago, on the nature of computing and intelligence.
The volumes contain 29 stimulating, if sometimes difficult, essays. Contributors
include Douglas Hofstadter of Gödel, Eschel, Bach fame, Herbert Simon,
Robin Gandy (Turing’s own PhD student), and Donald Michie who worked on code
breaking with Turing during the Second World War.