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 groundbreaking experiment designed by a team of top psychologists:
Pit your wits against visual challenges.
Get a brain sex profile and find out if you think like a man or a woman.
See how your results relate to theories about brain sex.
Contribute anonymously to a future BBC television programme.
You can come back to the test more than once to finish it. We'll need your first name or a nickname
so we can recognise you for log on purposes only.
Data Protection: The information you enter in the test is anonymous and cannot be linked to you. The data will be analysed by scientists as part of a new brain sex experiment and used for a future science television programme.