When hen the first author wrote the introductory chapter of Sociobiological ctives Perspectives on Human Development (MacDonald, 1988a), the basic llllllllllll approach was to attempt to integrate evolutionary thinking with prominent strands of theory already influential in developmental psychology— particularly social learning theory, cognitive developmental theory, behavior genetics, and etho...

which tend to capitalize on similarity rather than change. Time ranges of biologic rhythms are explored and an enormous variation is evident ranging from fractions of a second within an individual to millions of years in an evolutionary scale. The influence and interplay of exogenous and endogenous factors in such rhythms are discussed and abnormalities of rhythms are considered to be of fundam...