The International Journal of Psychophysiology is the official journal of the International Organization of Psychophysiology, and provides a respected forum for the publication of high quality original contributions on all aspects of psychophysiology. The journal is interdisciplinary and aims to integrate the neurosciences and psychological sciences. Within this framework, the subjects covered include sensation and perception, learning and memory, evolution and development of behaviour, motivation and emotion, aggression and defence, interhemispheric relations, information processing, sleep, stress, psychopharmacology and psychophysiological disorders. 11th World Congress of Psychophysiology The 11th World Congress of Psychophysiology will take place July 29-August 3, 2002 in Montreal, Canada. For full details of this Official Congress of the International Organization of Psychophysiology visit the conference website at: http://www.elsevier.com/locate/iop2002