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Recent brain research has revealed structural differences in the hypothalamus in relation to biological sex and sexual orientation. Differences in size and cell number of various nuclei in the hypothalamus for homosexual versus heterosexual men have recently been reported in two studies. We have found that a cluster of cells in the preoptic area of the human hypothalamus contains about twice as many cells in young adult men as in women. We have called this cluster the sexually dimorphic nucleus SDN.
The magnitude of the difference is the SDN depends on age. In other human research, two other hypothalamic nuclei interstitial nuclei of the anterior hypothalamus [INAH] 2 and 3 and part of the bed nucleus of the stria terminalis BST have been reported to be sexually dimorphic in the human.
Sexual differentiation to the human brain takes place much later than originally claimed. The cell number rapidly increases in boys and girls at the same rate until 2 to 4 years of age. After that age period, a decrease in cell number takes place in girls, but not in boys. This causes the sexual differentiation of the SDN. Pornative
Gay men and heterosexual women have similarly shaped brains, research shows
Meet The Hottest Gay Brains in History
- Striking similarities between the brains of gay men and straight women have been discovered by neuroscientists, offering...
- New neuroimaging research has found that gay, bisexual, and straight men have different...
- Recent brain research has revealed structural differences in the of various nuclei...
From an evolutionary point of believe, homosexuality is rather difficult to explain. Any genetic trait that reduces the chances of producing the offspring usually gets eliminated very quickly in populations. Nonetheless, homosexuality appears to persist in humans throughout the history of our species.
There are multiple hypotheses attempting to explain that phenomenon but no hard proofs confirming any of them. Divers scientists believe that sexual position is determined by peculiarities in the structure of the percipience.
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- J INT MED RES. ;39(1) HAEMODYNAMIC BRAIN RESPONSE TO VISUAL SEXUAL STIMULI IS DIFFERENT BETWEEN HOMOSEXUAL AND HETEROSEXUAL MEN. HU...
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- WIRED THIS WAY: SEXUAL ORIENTATION AND GENDER IN THE BRAIN. — STUFF ABOUT BRAINS
- INDEED, STUDIES HAVE FOUND THAT MANY REGIONS IN GAY BRAINS, WHICH LARGE FOR HETEROSEXUAL MEN AS COMPARED TO THEIR...
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Study Says Brains of Gay...
The fMRI study of 26 heterosexual, 28 bisexual, and 25 homosexual men found that sexual orientation was associated with distinct patterns of brain activation.
For instance, gay men and straight women showed greater neural connectivity in the cingulate cortex and contralateral amygdala regions than straight men and lesbians respectively.
They found heterosexual women and gay men shared brain circuitry linking a region called the amygdala, which plays a key role in emotional responses, to other parts of the brain. BSTc of hetero- and homosexual men. He has an extensive publication history on various topics related to medical sciences. The former takes place during the second half of pregnancy while the latter starts much earlier, within the first 8 weeks of gestation.
From an evolutionary point of view, homosexuality is rather difficult to explain.