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These examples all culminate in a challenge hypothesis model which focuses on the role of testosterone on aggression in the breeding season. The challenge hypothesis most likely cannot be applied to the non-breeding season since, as mentioned above, there is most likely a mechanism independent of testosterone governing aggression in the non ...
The Organizational-Activational Hypothesis states that steroid hormones permanently organize the nervous system during early development, which is reflected in adult male or female typical behaviors. [1] In adulthood, the same steroid hormones activate, modulate, and inhibit these behaviors.
The hypothesis separately proposes that hormonal changes across the cycle cause women, when they are most likely to get pregnant, to be more attracted to traits in potential short-term male sexual partners that indicate high genetic quality, leading to greater reproductive success. [3]
In life history theory, the cost of reproduction hypothesis is the idea that reproduction is costly in terms of future survival and reproduction. This is mediated by various mechanisms, with the two most prominent being hormonal regulation and differential allocation of internal resources.
The timing hypothesis, gap hypothesis, gap theory, or critical window hypothesis for menopausal hormone therapy is a scientific theory that the benefits and risks of menopausal hormone therapy vary depending on the amount of time a woman has been in menopause upon initiation of treatment.
Hrdy's hypothesis is an extension of the male assistance hypothesis, in that both hypotheses argue that women have evolved this adaptation to gain some tangible benefit from males. According to Hrdy's hypothesis, [ 6 ] [ 7 ] extended female sexuality is an adaptive process with an aim of creating paternity confusion in their male counterparts ...
Endocrinology (from endocrine + -ology) is a branch of biology and medicine dealing with the endocrine system, its diseases, and its specific secretions known as hormones.It is also concerned with the integration of developmental events proliferation, growth, and differentiation, and the psychological or behavioral activities of metabolism, growth and development, tissue function, sleep ...
Sex hormones in the prenatal environment differentiate the male and female brain. One hypothesis proposes that transgender individuals may have been exposed to atypical levels of sex hormones during later stages of fetal development, leading to brain structures atypical of their sex assigned at birth. [5] [10]