Don't Make Men Smarter Men's brains may weigh a few more ounces, but women have just as much gray matter.
Women have smaller brains than men.
Wrong, wrong, wrong. Men and women consistently score equally well on intelligence tests, despite the difference in brain size. Neuroscientists have grappled with that puzzle for years. All kinds of research have shown that the bigger the brain, generally, the smarter the animal, although other factors affect intelligence. Now a team of researchers from the University of Pennsylvania has come up with an explanation for the brain-size mystery.