belinda said:
Also - I don't think you mean the 16th percentile - that would mean that on average females score as well as the bottom 16% of males.
Yes, that's exactly what I mean-- look at the article I cited, by the premier researcher in the field (who happens to be female).
The male / female difference on math and spatial tasks is 1 standard deviation, putting the average female at just the 16th% of males.
There are verbal tasks where the difference is as big, but in the other direction-- favoring females.
You really should check out the article-- the differences have little to do with socialization, or "academic self concept" (blech! what journal is that crap published in?) but testosterone versus estrogen, and sex differences in brain anatomy.
Just some interesting examples:
1) The size of the math difference is biggest when the female is on her period-- where estrogen levels are highest.
2) Older males given testosterone also show a boost in math / spatial skill.
3) Females exposed to too much androgen while developing in the womb (i.e., CAH females):
a) score higher than normal females on math and spatial tasks,
b) prefer male toys (i.e., gi joe) over female toys (i.e. dolls)
and,
c) are more likely to be lesbian.
4) as kids, females originally do better in math. Once puberty kicks in (i.e. male increase in testosterone levels) males do better by a lot, and the difference remains throughout the lifespan.
5) Perfect scores on the SAT math section are 100 to 1 by males (iirc).
Verbal Stuff:
Although the male brain on average is bigger, the female corpus collosum (the bundle of fibers on the top / center of the brain that let the two hemispheres communicate) is bigger on average in females.
Further, females-- with high probability-- process language in both hemispheres; whereas right handed males use the left hemisphere just about exclusively.
6) Females do much better in reading comprehension, verbal fluency and synonym generation measures
7) 3 x 5 times as many males stutter, or get dyslexia.
I can go on, but the evidence that the difference is biologically based is outstanding.
Further, it even explains why men on average make more money than women on average.
When controlling for occupation type, the earnings gap disappears for women in their 20's and 30's, and shrinks to only 4% for older females.
B