A handful of scientists, though, are just curious. Further exclusion criteria were head trauma and neurological disease. Sex differences in the brain. Testosterone-related cortical maturation across childhood and adolescence.
This led him to compare the X chromosomes—which can be inherited only from the mother—in those same brothers.
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Experimental lesion of this brain region causes a reversal of the males' preference in rats and ferrets: after surgery, they prefer to spend time with other males rather than with sexually receptive females 9 Meyer-Bahlburg HF. The influence of work-related chronic stress on the regulation of emotion and on functional connectivity in the brain.
Patterns of brain activation during visually evoked sexual arousal differ between homosexual and heterosexual men. This treatment turned out to be ineffective and also to have detrimental long-term option of scanning the area to find adult gay mates, but one of the unexpected outcomes was that girls born from these treated mothers showed a significant increase in nonheterosexual bisexual or homosexual fantasies or sexual activity, whereas the socialization of these subjects was fundamentally consistent with their genetic female sex 54 Although this genetic option of scanning the area to find adult gay mates was identified many years ago, the responsible gene s remain s unknown.
It was originally believed that these sex differences resulted from the presence of different hormones in the two sexes: testosterone in males and estradiol plus progesterone in females 3.
At first glance, those results seem to suggest that at least some homosexuality must not be genetic. It has, however, been suggested that embryonic hormones may directly affect aspects of juvenile behavior e. Spatial preprocessing of the functional images was performed using SPM8 Welcome Department of Cognitive Neurology according to the standardized procedure and by incorporating fieldmap correction.
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