Testosterone is often considered a critical regulator of aggressive behaviour. There is
castration/replacement evidence that testosterone indeed drives aggression in some …

Social behaviors, such as mating, fighting, and parenting, are fundamental for survival of any
vertebrate species. All members of a species express social behaviors in a stereotypical and …

Since Dr. Brizendine wrote The Female Brain ten years ago, the response has been
overwhelming. This New York Times bestseller has been translated into more than thirty …

Research into the lives of animals in their natural environments has revealed a rich tapestry
of complex social relationships and previously unsuspected social and mating systems. The …

Experience in aggressive contests often affects behaviour during, and the outcome of, later
contests. This review discusses evidence for, variations in, and consequences of such …

Background Although traditional wisdom suggests that baseline levels of testosterone (T)
promote aggressive behavior, decades of research have produced findings that have been …

A large body of evidence indicates that individual differences in baseline concentrations of
testosterone (T) are only weakly correlated with human aggression. Importantly, T …

Past research suggests that individuals high in basal testosterone are motivated to gain high
status. The present research extends previous work by examining endocrinological and …

Testosterone (T) levels can fluctuate after wins and losses, but surprisingly, there are no
empirical studies in humans that have tested whether these post-competition T changes …

Considerable evidence suggests that the steroid hormone testosterone mediates major life-
history trade-offs in vertebrates, promoting mating effort at the expense of parenting effort or …