This difference in toy choices, however, is quite a leap from the theory that the brains of men and women are deeply, structurally different because of how much testosterone they’ve been exposed to. It’s also a considerable distance from Simon Baron-Cohen’s claim that there’s such a thing as a typical male brain and a typical female brain – one that likes mathematics, and another that prefers coffee mornings. For Baron-Cohen to be right, there would have to be noticeable gaps in lots of other behaviours as well.