Differences between men and women in intelligence and behavior have been proposed and disputed for decades .

Now, a growing body of scientific evidence shows hundreds of genes act differently in the brains of biologically male or female humans.

What this means isn't yet clear, though some of the genes may be linked to sex-biased brain disorders such as Alzheimer's and Parkinson's diseases.

These sex differences between male and female brains are established early in development, so they may have a role in shaping brain development. And they are found not only in humans but also in other primates, implying they are ancient.

Gene activity in male and female brains

Decades of research have confirmed differences between men and women in brain structure, function and susceptibility

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