The question of whether testosterone affects aggression in men

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The question of whether testosterone affects aggression in men

Find articles by Menelaos L. Batrinos, 8 Evripidou Str,Kifisia, Greece. This article has been cited by other articles in PMC. Abstract Atavistic residues of aggressive behavior prevailing in animal life, determined by testosterone, remain attenuated in man and suppressed through familial and social inhibitions.

However, it still manifests itself in various intensities and forms from; thoughts, anger, verbal aggressiveness, competition, dominance behavior, to physical violence. Testosterone plays a significant role in the arousal of these behavioral manifestations in the brain centers involved in aggression and on the development of the muscular system that enables their realization.

There is evidence that testosterone levels are higher in individuals with aggressive behavior, such as prisoners who have committed violent crimes. Several field studies have also shown that testosterone levels increase during the aggressive phases of sports games.

Aggressive behavior arises in the brain through interplay between subcortical structures in the amygdala and the hypothalamus in which emotions are born and the prefrontal cognitive centers where emotions are perceived and controlled.

The action of testosterone on the brain begins in the embryonic stage. Earlier in development at the DNA level, the number of CAG repeats in the androgen receptor gene seems to play a role in the expression of aggressive behavior.

Neuroimaging techniques in adult males have shown that testosterone activates the amygdala enhancing its emotional activity and its resistance to prefrontal restraining control.

This effect is opposed by the action of cortisol which facilitates prefrontal area cognitive control on impulsive tendencies aroused in the subcortical structures. The degree of impulsivity is regulated by serotonin inhibiting receptors, and with the intervention of this neurotransmitter the major agents of the neuroendocrine influence on the brain process of aggression forms a triad.

Testosterone activates the subcortical areas of the brain to produce aggression, while cortisol and serotonin act antagonistically with testosterone to reduce its effects.

Testosterone, Cortisol, Serotonin, Aggressiveness 1. Introduction Aggressive behavior has been variously defined and it is exhibited with a broad spectrum of manifestations from the tendency to aggressiveness to physical violence.

It is a primitive and common social behavior that the media report with hidden satisfaction, using it as a means of describing exciting news, and the people of civilized countries accepts its manifestation with horror and a subconscious disturbance, because such manifestations shake the comfortable belief of the difference of human conduct from that of animals.

Violent and aggressive behavior is a natural and physiological element that rules animal life, driven as it is by the instincts of survival and the preservation of species through reproduction.

Attenuated residues of these instincts remain in humans, albeit suppressed by familial and social inhibitions, but it still manifests in modified and various forms in accordance with the idiosyncrasy, temperament and the psychological state of each individual 1 - This review is a discussion of the implications of testosterone in aggressive and violent behavior, presenting the endocrine axis and the neural circuits involved in its action and focusing on the clinical aspects of the problem and neuroimaging findings.

The omission of a vast body of experimental work in animals regarding the relationship of testosterone with aggression, by no means indicates a reduction of interest and esteem in the importance of these publications by the author. His intension was to review the research in the features and effects of these fundamental research findings with the physiology and psychology of man.

Relationship of Basal Testosterone and Its Fluctuations with Aggressive Behavior Aggressiveness is exhibited in various forms and intensities from; thoughts, bodily arousal and anger to verbal, dominant, competitive traits and serious acts of violence.

The manifestation of this behavioral spectrum is associated with and served by the mobilization of the muscular system. There is great interest in the implications of this hormone on aggression because of the social importance of this issue, it has been made more intense and vivid not only by researchers in the field, but also by other members of society such as; politicians, criminologists, law-makers, judges, police authorities and psychologists, who await informed research to define their attitudes on the basis of these studies and more specifically on the ability to answer these two questions: What is the relationship of normal levels of blood testosterone and its fluctuation with aggressiveness?

Does the administration of hyperphysiological doses of testosterone increase aggression and violent behavior?

Death By Vaccination The Effects of Testosterone on the Body Medically reviewed by George Krucik, MD on April 21, — Written by Ann Pietrangelo Testosterone is a vital male hormone that is responsible for the development and maintenance of male attributes. Women also have testosterone, but in much smaller amounts.
Testosterone – the hormone of aggression? It can also affect your mood, weight, and concentration. At 52, he had always had an active sex life.

A positive answer was anticipated regarding the first question from extensive experimental research in animals and research conducted in prisoners. Prison is an environment in which a majority of its inmates have shown violent behavior in the past and where dominance behavior prevails.

The first study in prisoners was conducted insoon after the feasibility of testosterone estimation, by Kreutz and Rosel, who found that prisoners who had committed violent crimes during their adolescence had higher testosterone levels In a single sample measurement of free testosterone in the saliva of 89 prison inmates, it was found that at the extremes of the testosterone distribution, the relationship between testosterone to aggression was more striking Ten out of 11 inmates with the highest testosterone concentrations had committed violent crimes, whereas 9 out of 11 who had committed non-violent crimes had the lowest testosterone levels.

Similar data were reported by others 41516but these results should be seen with caution because of methodological limitations small number of subjects and samplesbut mainly because of the unnatural conditions of life in prison.

Studies in sexual offenders independent of their brutality gave diverging results. Blood testosterone was within the normal range or increased and testosterone associated or not associated with aggression was also reported 417 Clinical data from the non-prisoner population necessary to confirm the above findings in normal free men is limited.

Most studies have been based on self-report questionnaires, which record actual aggression and its intensity with questionable likelihood. In a series of such studies, which gave conflicting results, the majority of these confirmed the relationship of testosterone with aggressiveness reported in prisoners 4.Prof.

Grant’s response.

The question of whether testosterone affects aggression in men

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Human Stress Responses The human stress response coined, "fight or flight" by Walter Cannon in is a hormonal response characterized by the release of epinephrine and norepinephrine. Of course, everyone has different goals and it depends where you are now and where you want to get to!

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Learn how this hormone affects the body. Most men have more than enough testosterone. But, it’s possible for the body to produce too little testosterone. including aggression and.

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