Boys vs. Girls in Math: The Difference is Only Cultural

Boys tend to be better at math. That’s been the stereotype, but a new study (Kane and Mertz, 2011) published in the Notices of the American Mathematical Society provides evidence that, at all levels, it’s only because society and culture tend to support, and advance the stereotype.

… we conclude that gender equity and other sociocultural factors, not national income, school type, or religion per se, are the primary determinants of mathematics performance at all levels for both boys and girls. … It is fully consistent with socioeconomic status of the home environment being a primary determinant for success of children in school.

— Kane and Mertz, 2011: Debunking Myths about Gender and Mathematics Performance in Notices of the American Mathematical Society.

Kane and Mertz compared math achievement in a number of countries. If there were some genetic reason for different math abilities then boys should be better than girls everywhere. This is not the case. In more wealthy countries where there is more equality between the genders, the mathematics performance gap disappears.

In poorer countries like Tunisia boys tend to do better at math, while in rich ones like Barhrain girls do better. However, in places with greater equity between the genders, like the Czeck Republic, boys and girls do equally well. Figure from Kane and Mertz (2011).

Do Single Sex Schools Make a Difference?

A recent article by Diane Halpern in Science looks at the data about single-sex schooling and finds little evidence of benefits.

There’s a podcast interview with Halpern that elaborates on the story, but Tamar Lewin’s article in the New York Times does a great job at looking at the different sides of the issue.

… sex-segregated education—is deeply misguided, and often justified by weak, cherry-picked, or misconstrued scientific claims rather than by valid scientific evidence. There is no well-designed research showing that single-sex (SS) education improves students’ academic performance, but there is evidence that sex segregation increases gender stereotyping and legitimizes institutional sexism.

— Halpern et al., 2011: The Pseudoscience of Single-Sex Schooling

My personal, (very) anecdotal experience would argue the opposite, however. At least in secondary school, not having all the inter-gender interactions was quite beneficial. It may not have made me the best student (or even a good student), but it was at least one less complication to worry about while I was trying, or trying to avoid, learning.

The author are directors of the American Council for CoEducational Schooling, so they do have a definite point of view. Their Why Co-Ed? page makes the arguments for Co-Ed schools in nice bullet points.

Their arguments seem to be based on the evidence that gender segregated schools encourage stereotyping, usually to the detriment of the girls. Gender segregation is particularly suspect when it’s based on the idea that boys and girls learn very differently. There are certainly differences (e.g. as in their approach to games, and blogging) but having all this diversity in approaches and perspectives in the same classroom has been generally beneficial in my experience.

My only real major outstanding question is the effect of the increased sex drive that comes with puberty on students’ ability to learn. Although they admit it as a potential problem, their counter is that students in single-sex environments don’t learn how to interact properly with the other gender. Adolescents need all the opportunity they can get to learn how to normalize their interactions with the opposite gender. My own anecdotal evidence would definitely support this contention, but I’d like to see it backed up with more research, nonetheless.

… the rise in testosterone at puberty, which happens in both boys and girls, has one clear-cut effect: elevating sex drive in both males and females. There is no question that this can change the dynamics in a middle- or high-school classroom;

… there is evidence that gender segregation disturbs boy-girl interactions when the two sexes do come together at lunch, recess, or more formal social gatherings.2 Lacking the opportunity to work together in a serious, non-sexual environment, boys and girls may over-glamorize, misunderstand, and even harass the other sex when they do have a chance to mingle outside the classroom.

— Halpern et al., 2011: The Pseudoscience of Single-Sex Schooling

I’m troubled about the use of the word “may” in the second paragraph; the evidence either way seems equivocal. It’s good, though, to see someone compiling the research.

I do think single-gender education should be an option that’s available, but I’d like to see the arguments either way be based on sound science. The simple fact that boys and girls learn differently (on average) does not mean they would benefit from learning separately.

And Women Inherit the Internet

Women are the routers and amplifiers of the social web. And they are the rocket fuel of ecommerce.

–Aileen Lee (2011): Why Women Rule The Internet on TechCrunch.com.

Last month I observed that the girls in my class were blogging a lot more than the boys. It’s still true, and now there’s an informative, if somewhat hyperbolic, article by Aileen Lee that asserts that the blooming of social media websites is driven, primarily, by women.

I’m always a bit leery about articles like this one. There are lots of statistics, a few anecdotes, and a brief reference back to some scientific research (Dunbar numbers), but the overly excited language coming from a venture capitalist is enough to remind me of the irrational exuberance of the dot-com bubble.

The writing is so over-the-top, that I’m truly surprised that there isn’t a single exclamation point in the entire article! Although, based on Ms. Lee’s first words in the comments section, this might be due to the herculean efforts of a good editor.

My antipathy might also be due to my irrational, visceral distaste of the language of business and commerce, which is so geared toward breaking people into faceless demographic groups to be marketed to that it verges on being dehumanizing. I suspect my feelings are truly irrational because I’ve seen scientists do similar parsing of demographic statistics and have had no trouble; although, perhaps, I may have been a little more empathic because the scientists were looking at issues of vulnerability to disease, infant mortality, and the like.

However, since the article’s anecdotes correlate with my own anecdotes, I find it hard to disagree with the underlying premise: women are more inclined than men to make and nurture social connections so they are a key demographic in understanding the future of the internet.

It’s also a reminder that the social atomization typified by the dominance of the nuclear family at the expense of extended family, is now being ameliorated by social networking, which suggests some interesting social and cultural changes in a, possibly, more matrifocal future.

(hat tip The Daily Dish).

Boys, girls, and blogs

There’s a curious and clear gender difference when it comes to my student’s use of their blogs. All the girls have them and most are posting things right now, but the boys don’t.

This is in large part due to the way I rolled out the student blogs. I started with a couple students (girls) who were most interested, and since then I’ve been setting up blogs for students as they’ve been requested. The process has been slow because I’ve been trying the multi-user version of WordPress (WPMU), which is not nearly as easy to set up as a stand-alone WordPress installation (like the one used for the Muddle). I think, however, that I have the setup process worked out now, so I could accelerate the rollout if necessary.

Since the two students I started with were girls, it’s perhaps not too surprising that it’s the other girls who were most interested in getting their own. That’s the way the social connections are arranged in our class.

Scattergram showing how girls' (red) brains mature differently than boys' (blue). Data from Lenroot, 2007.

Though there’s no real evidence for it, I do wonder, however, if there is a gender component to it too. Since girls tend to develop more quickly than boys at this age (see Sax, 2007 for a general description, and NIH, 2010 for a recent overview of adolescent brain development), so perhaps they’re more self-reflective. Girls also tend to emphasize interpersonal relationships more (e.g. Johnson, 2004), and are generally more communicative.

… females (1) develop more intimate friendships, (2) stress the importance of maintaining intimacy, and (3) expect more intimacy in their friendships than do males. — in Gender, grade, and relationship differences in emotional closeness within adolescent friendships by Johnson, (2004)

At any rate, I’m curious to see how this develops. I think I’m going to remind the whole class about the blogs though.

(Excel Spreadsheet used to create the brain volume scattergram: here.)