Many physiological and psychological processes fluctuate throughout the day in fairly stable, rhythmic patterns. The relationship between individual differences in circadian activity rhythms and a sense of time urgency were explored as well as a number of achievement-related variables. Undergraduates (N=308), whose circadian activity rhythms were…

This study investigated: (1) the differences in competition-cooperation behavior of male and female children in a two-person game; and (2) whether sex differences in behavior were affected by either the sex of the game partner or by instructions. Subjects were 72 urban, middle class boys and girls. Their mean age was 7 years 11 months. Children…