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Psychological sex differences are thought by some to reflect the interaction of genes, hormones, and social learning on brain development throughout the lifespan. A 2021 meta-synthesis led by Lise Eliot found that sex accounted for 1% of the brain's structure or laterality, finding large group-level differences only in total brain volume. [ 1 ]
The human brain. Differences in male and female brain size are relative to body size. [85] Early research into the differences between male and female brains showed that male brains are, on average, larger than female brains. This research was frequently cited to support the assertion that women are less intelligent than men.
This may bring into question the effectiveness of brain development studies in treating and successfully rehabilitating criminal youth. [9] It's a common misconception to believe the brain stops development at any specific age. In the 2010s and beyond, science has shown that the brain continues to develop until at least 30 years of age. [10]
Genes involved in the neuro-development and in neuron physiology are extremely conserved between mammalian species (94% of genes expressed in common between humans and chimpanzees, 75% between humans and mice), compared to other organs. Therefore, few genes account for species differences in the human brain development and function. [15]
Female orcas start breeding at around 6-10 years old, males at 10-13 years. Breeding occurs all year round although it is most common in summer. The gestation period of an orca is about 17 months ...
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One piece of evidence comes from the study on female Japanese macaque, which routinely court, mount (with pelvic thrust), compete for, and even prefer certain female sexual partners over certain males. The part of the brain examined is the anterior hypothalamic nucleus (AHdc), a homologue of SDN-POA.
The 2006 book The Female Brain (book) by Louann Brizendine, M.D. about the subject. This page was last edited on 14 ...