Less testosterone

The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression". [79] [80] Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible. [79] The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game. [81] Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males. [82] [83] [84] [85] [86]

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While testosterone is typically seen as a "male" hormone, it's also present (albeit in much smaller amounts) in women. However, between 4-7% of American women produce too much testosterone in their ovaries, which usually leads to a condition called polycystic ovary syndrome. [1] Too much testosterone in women can lead to infertility due to lack of ovulation, as well as some embarrassing symptoms like acne, a deepening voice and facial hair growth. Reducing testosterone levels in women is often accomplished with medication, although dietary change can make a positive impact also.

Among healthy young men, the blood oxygen level-dependent (BOLD) response in the amygdala to fearful and angry faces co-varies positively with individual differences in serum testosterone concentrations ([63,64], but see [65]). Exogenous testosterone has been shown to activate the amygdala in young women viewing angry facial expressions [66] (Figure 4). A mechanism underlying these observations might be that testosterone induces a functional decoupling between OFC and amygdala activity [67,68]…In humans, single acute doses of testosterone have been shown to reduce subconscious fear (Figure 5) and fear-potentiated startle [44,89].

Less testosterone

less testosterone

Among healthy young men, the blood oxygen level-dependent (BOLD) response in the amygdala to fearful and angry faces co-varies positively with individual differences in serum testosterone concentrations ([63,64], but see [65]). Exogenous testosterone has been shown to activate the amygdala in young women viewing angry facial expressions [66] (Figure 4). A mechanism underlying these observations might be that testosterone induces a functional decoupling between OFC and amygdala activity [67,68]…In humans, single acute doses of testosterone have been shown to reduce subconscious fear (Figure 5) and fear-potentiated startle [44,89].

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