This volume contains the proceedings of a postgraduate course for medical practitioners of various specialties. One purpose of the course was to provide factual data on developmental aspects of the brain and behaviour, and about the possible impact of several important categories of internal and environ- mental factors upon neural development. Another purpose was to indicate the extent and the limitations of the methodology now available for the scientific approach of the study of the development of behaviour. In general the investigator is faced with methodological problems of two types, the...