Expectations Affect Women's Math Scores

Oct. 20, 2006 — Telling women they can't do well in math may turn out be a self-fulfilling statement. In tests in Canada, women who were told that men and women do math equally well did much better than those who were told there is a genetic difference in math ability.

And women who heard there were differences caused by environment — such as math teachers giving more attention to boys — outperformed those who were simply reminded they were females.

The women who did better in the tests got nearly twice as many right answers as those in the other groups, explained Steven J. Heine, a psychology professor at the University of British Columbia in Vancouver.

Expectations, it turns out, really do make a difference.

"The findings suggest that people tend to accept genetic explanations as if they're more powerful or irrevocable, which can lead to self-fulfilling prophecies," said Heine.

The math study is the latest since Harvard University's president ignited controversy last year by suggesting that innate gender differences may partly explain why fewer women than men reach top university science jobs. The comment eventually cost him his job.

Heine and doctoral student Ilan Dar-Nimrod wanted to see how people are affected by stereotypes about themselves. They divided more than 220 women into four groups and administered math and reading comprehension tests between 2003 and 2006. Their results are reported in Friday's issue of the journal Science.

"Our study doesn't explore whether innate sex differences exist," said Dar-Nimrod. "Instead, we investigated how the perceived source of stereotypes can influence women's math performance."

The women were given a math test, then asked to read an essay, and then given a second math exam.

In two groups the women averaged between five and 10 correct answers out of 25 math questions. In the other two they averaged between 15 and 20 correct.