Women More Intelligent: “Men And Women Do, In Fact, Have Different Brain Structures And Sizes”
“Women tended to have significantly thicker cortices than men. Thicker cortices have been associated with higher scores on a variety of cognitive and general intelligence tests.…
- Women’s brains had larger subregions of the cortex—the cortical subregions are discrete parts of this particular brain section associated with memory, sensory input, learning, and making choices…women’s brains tended to be more similar to each other
- Men’s brains tend to be bigger overall…Additionally, there was a lot of variation in the sizes of different brain regions in men…men had higher brain volumes than women in every subcortical region they looked at, including the hippocampus (which plays broad roles in memory and spatial awareness), the amygdala (emotions, memory, and decision-making), striatum (learning, inhibition, and reward-processing), and thalamus (processing and relaying sensory information to other parts of the brain)
- When the researchers adjusted the numbers to look at the subcortical regions relative to overall brain size, the comparisons became much closer: There were only 14 regions where men had higher brain volume and 10 regions where women did.
…it lines up with previous work looking at sex and IQ tests.
The fact that men’s brains had more differences among them “fits with a lot of other evidence that seems to point toward males being more variable physically and mentally,”
The differences between men and women’s brains were small enough that it’d be impossible for scientists to determine a person’s sex by looking at his or her brain alone.
…despite common findings of greater male variability in traits like intelligence, personality, and physical performance, variance differences in the brain have received little attention.
Males had higher cortical and sub-cortical volumes, cortical surface areas, and white matter diffusion directionality; females had thicker cortices and higher white matter tract complexity. Considerable overlap between the distributions for males and females was common, and subregional differences were smaller after accounting for global differences. There was generally greater male variance across structural measures. The modestly higher male score on two cognitive tests was partly mediated via structural differences. Functional connectome organization showed stronger connectivity for males in unimodal sensorimotor cortices, and stronger connectivity for females in the default mode network.”