All this happened, more or less.

Research is revealing that male and female brains are built from markedly different genetic blueprints, which create numerous anatomical differences. There are also differences in the circuitry that wires them up and the chemicals that transmit messages between neurons. All this is pointing towards the conclusion that there is not just one kind of human brain, but two.

In a 2001 study, Jill Goldstein of Harvard Medical School and colleagues measured and compared 45 brain regions in healthy men and women. They found that parts of the frontal lobe, which houses decision-making and problem-solving functions, were proportionally larger in women, as was the limbic cortex, which regulates emotions. Other studies have found that the hippocampus, involved in short-term memory and spatial navigation, is proportionally larger in women than in men, perhaps surprisingly given women's reputation as bad map-readers. In men, proportionally larger areas include the parietal cortex, which processes signals from the sensory organs and is involved in space perception, and the amygdala, which controls emotions and social and sexual behaviour.