Affiliation: | 1 School of Psychology, University of St Andrews, South Street, St Andrews, Fife, KY16 9JP, UK;2 School of Biology, University of St Andrews, Bute Medical Building, Queen''s Terrace, St Andrews, Fife, KY16 9TS, UK;3 Department of Anthropology, University of California, Davis, CA 95616-8522, USA |