ional male-dominated sociobiology gained momentum, a counter-attack was mounted which had two main facets. First, researchers found that other gender differences did, in fact, exist, including physical differences in height, muscularity after puberty, weight distribution, longevity, etc. and also in behavioral and personality traits. Second, as a result of the findings of neurobiologists during the past two decades, these observed differences were traced to pre-natal hormonally-derived brain structures. According to Pool, in the eighth week of pregnancy, "if the fetus is genetically male-if it has a Y chromosome-then a master switch on the Y chromosome clicks on" and "triggers . . . the embryonic glands to form into testes, which then begin to produce male hormones." In 1982, neurobiologist Roger Sperry "demonstrated that the left and right hemispheres of the brain house different mental abilities." Further findings purported to link certain observed skills of men, such as visual-spatial cognitive functions, which were identifi
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