Explains 200 key concepts in psychology, in short and accessible essays. Covers everything from consciousness to criminology, behaviourism and experimental ethics.

Marcus Weeks has written numerous books, such as How Many Molehills in a Mountain?: Measuring What You Don't Know in Terms of What You Do and Music: A Crash Course, and contributed to many titles for Dorling Kindersley, including The Philosophy Book, the Millennium Encyclopedia, and both Science and Art in 'The Definitive Visual Guide' series.