Some researchers say that men can have 'women's brains' and that women can think more like men.
Find out more about 'brain sex' differences by taking the Sex ID test, a series of visual challenges and questions used by psychologists in the BBC One television series Secrets of the Sexes:
Get a brain sex profile and find out if you think like a man or a woman.
See if you can gaze into someone's eyes and know what they're thinking.
Find out why scientists are interested in the length of your fingers.
See how your results relate to theories about brain sex.
