These are the basics that someone would learn of this stuff from intro psych:
With basic intelligence tests, the total IQ scores are comparable for men and women. What then, of specific abilities? The stereotype has been found to be true for specifics. Even today, among high school students who take the AP and SAT II tests, males score higher on average in physics, economics, computer science, chemistry, US government, biology and calculus. Females score higher in Spanish, French, German, art history, studio art and english literature.
At this point, this is what else specific studies have shown to occur:
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Verbal abilities From data gathered from millions of students from 1947-1980 girls outscored boys but the gap was narrowing. Girls are (on average) better spellers. They also score slightly higher than boys on tests of reading comprehension, writing and foreign languages.
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Mathematical abilities Girls are better at arithmetic in grade school, but males surpass females early in jr high school--a difference that continues to college and beyond and is found in other countries as well. This difference may also underlie the fact that males score higher on high-school physics, chemistry, and computer science achievement tests.
Spatial abilities Males outperform females on spatial tasks such as mentally rotating objects to determine what they would look like from another perspective and tracking moving objects in space. These skills are used in architecture, mechanical engineering, flight navigation and certain other types of work. This difference occurs as early as age 4 or 5. This may account for the disparity in SAT math scores. Studies have been conducted where scores were statistically adjusted to account for differences in spatial ability, the gender gap in math disappeared. Thus, the male advantage in math is intimately tied to the difference in spatial skills.
Why are there disparities in spatial relations?
Biological side The claim is made that the male hormone testosterone slows the fetal development of the left hemisphere, thereby enhancing the growth of the more spatial right hemisphere. Highly talented math students are thus also more likely to be left-handed, nearsighted and allergy sufferers--traits seen as linked to high prenatal levels of testosterone exposure.
Social side Some attributed the gender gap to stereotypes of math as a masculine subject, less encouragement of girls by parents and teachers, and different experiences in childhood. For example, boys use spatial skills more often through contact sports, action-packed video games, construction sets and transformer type toys. Consistent with this hypothesis, two studies have shown that playing action video games improves spatial-test performance--in girls as well as boys.
I'm too lazy to list all the references, but these I thought were the most interesting. They aren't in standard form, but I just put what you'd need to look the shit up. If you need others, let me know
testosterone and performance
Benbow (198 8) Behavioral and Brain Sciences, 11, 169-232
Kimura (1999) Sex and Cognition, Cambridge, MA: MIT press
Video games and spatial performance:
Okagski and Frensch (1994) Journal of applied developmental psych, 15, 33-58
Subrahmanyan and Greenfield (same journal issue), 13-32
[ 25 February 2002: Message edited by: fizzygirl ]