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The pattern between testosterone and aggression was first observed in seasonally breeding birds, where testosterone levels rise modestly with the onset of the breeding season to support basic reproductive functions. However, during periods of heightened male aggression, testosterone levels increase further to a maximum physiological level.
The hypothesis has been subsequently expanded and modified to predict relationships between testosterone and aggression in other species. For example, chimpanzees, which are continuous breeders, show significantly raised testosterone levels and aggressive male-male interactions when receptive and fertile females are present. [96]
One of the central pillars of ENA theory is that fetal testosterone levels cause permanent changes in male brains that lead to increased criminality later in life. However, while individual studies have provided strong results on the effect size of fetal testosterone on aggressive or violent behavior, meta-analyses have remained less conclusive.
Testosterone is the primary male sex hormone and androgen in males. [3] In humans, testosterone plays a key role in the development of male reproductive tissues such as testicles and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
The field of psychology has been greatly influenced by the study of genetics. [1] Decades of research have demonstrated that both genetic and environmental factors play a role in a variety of behaviors in humans and animals (e.g. Grigorenko & Sternberg, 2003). The genetic basis of aggression, however, remains poorly understood. Aggression is a ...
In psychology, the Eysenck Personality Questionnaire (EPQ) is a questionnaire to assess the personality traits of a person. It was devised by psychologists Hans Jürgen Eysenck and Sybil B. G. Eysenck. [1] Hans Eysenck's theory is based primarily on physiology and genetics. Although he was a behaviorist who considered learned habits of great ...
A 1996 Psychology Today article referred to the phrase as "only a joke", but noted that a study about testosterone and male employment had shown that testosterone levels were lower for successful new male employees at a southern U.S. oil firm than they were for new male employees who had quit their jobs or been terminated.
Testosterone is secreted by the testicles of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid. See Testosterone: Aggression and criminality and Testosterone: Brain for more information on how testosterone effects behavior. [citation needed]