gzuckier:
well i definitely notice a difference in social interactions between the two sexes, on the average, but i wonder how much of that is learned. and then, how much of the learned is builtin, so to speak; for instance, suppose (as i sometimes wonder) if it's all down to the fact that little girls figure out early on that their mother is a girl like them; and little boys figure out there mother is a girl, and they're not; and that this sets girls off on a path of sort of having things in common, while boys are set off on a path of differences. (on the average). that's sort of environmental, then, but there's not a lot you can do about the fact that girls are born female and boys aren't, which makes it essentially hereditary. the "control group" of course would be babies whose primary caretakers are male, particularly where there's a female parent figure who plays the role a male does most of the time, i.e. secondary caretaker; but that's still pretty rare. and in cultures where babies are breastfed, obviously it's going to stay pretty rare. so there are questions which can't be answered from the top down, i guess; they'll have to wait until we get at them from the bottom up, so to speak, i.e. understanding genetics and development on the cellular and molecular level. and that's going to be a looooooong time from now.
Well that's an interesting question. First there's no question that infant boys and infant girls are different - I've had one of each and I can attest to that. So that's sort of a counter to what Schaffer is saying - I think it's clear that there are most definitely differences between 2 year old girls and 2 year old boys. She concedes that. So given that, even if the differences disappear completely by adulthood, you still can't say "there's no mental difference between human males and females," at best you have to qualify it -- "by adulthood, there's no evidence of mental difference between human males and females" (assuming even that's true)
So the question isn't "are male brains and female brains different," the question at best is "do male brains and female brains become the same, eventually, or do they stay different (and if so, does it make any difference)"
if the difference is purely cultural, then I think you should expect to see cultural variation greater than gender variation - that is, there ought to be some cultures where the boys play with dolls and the girls play with trucks, say. The lack of that divergence indicates to me that the cultural component (which probably exists) isn't entirely independent.
I imagine you could change the way girls react, culturally, if you raised them in an environment with only men - no female caregivers of any kind. Don't think you'd make them into males, culturally, but I do think it'd have an impact. But if that's the mechanism by which the genes express the difference, then it's like saying that the difference in average height between men and women is irrelevant because you could surgically shorten the men and lengthen the women.
--s