What observable anatomical differences are there between the brains of men and women?

H0T-Lead

The corpus calossum, the bit of the brain that connects the left hemisphere with the right hemisphere, is considerably larger in females. This has the effect of allowing the female to accomplish more simultaneous generalised activity (multitasking) but limits the ability to concentrate on a single task to the exclusion of all outside distraction (concentrated effort). It is thought by some anthropologists to point to a human hunter-gatherer origin with a sexual division of labour, wherein the female gathered vegetable and small prey foodstuffs (requiring greater peripheral vision and overall situational awareness), while the male hunted larger and more dangerous prey (requiring high levels of concentration and an ability to ignore distractions). This is manifested in today's men and women by an uncanny ability on the part of the woman to spot any error, no matter how small, on the part of the man and an equally uncanny ability on the part of the man to remain completely deaf to her imprecations while Dallas is on the 3rd yard line and the call is 4th down and inches to go. Nov 22 05, 4:55 AM

gmackematix

Thanks H0T, but the answer is not as cut and dried as all that: http://en.wikipedia.org/wiki/Corpus_callosum Nov 22 05, 7:52 PM