Answer :
While serotonin and cortisol work against testosterone to diminish its effects, testosterone activates subcortical regions of the brain to cause aggression.
The amount of CAG repeats in the androgen receptor gene appears to influence the expression of aggressive behaviour earlier in development at the DNA level. testosterone activates the amygdala, increasing its emotional activity and resistance to prefrontal restraining control, according to research using neuroimaging techniques on adult males. Cortisol's activity, which supports prefrontal area cognitive control over impulsive inclinations arousing in the subcortical regions, counteracts this impact. Serotonin inhibitory receptors control the degree of impulsivity, and with the help of this neurotransmitter, the three main neuroendocrine factors that affect aggression in the brain come together to form a triad.
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