But whether they grew up to be biologists or sociologists or lawyers, when they were surveyed in their 30s, these women were as content with their careers as their male counterparts. They also made as much money per hour of work. Dr. Lubinski and Dr. Benbow concluded that adolescents’ interests and balance of abilities — not their sex — were the best predictors of whether they would choose an “inorganic” career like physics.

A similar conclusion comes from a new study of the large gender gap in the computer industry by Joshua Rosenbloom and Ronald Ash of the University of Kansas. By administering vocational psychological tests, the researchers found that information technology workers especially enjoyed manipulating objects and machines, whereas workers in other occupations preferred dealing with people.

Once the researchers controlled for that personality variable, the gender gap shrank to statistical insignificance: women who preferred tinkering with inanimate objects were about as likely to go into computer careers as were men with similar personalities. There just happened to be fewer women than men with those preferences.

Now, you might think those preferences would be different if society didn’t discourage girls and women from pursuits like computer science and physics. But if you read “The Sexual Paradox,” Susan Pinker’s book about gender differences, you’ll find just the opposite problem.

Ms. Pinker, a clinical psychologist and columnist for The Globe and Mail in Canada (and sister of Steven Pinker, the Harvard psychologist), argues that the campaign for gender parity infantilizes women by assuming they don’t know what they want. She interviewed women who abandoned successful careers in science and engineering to work in fields like architecture, law and education — and not because they had faced discrimination in science.

Instead, they complained of being pushed so hard to be scientists and engineers that they ended up in jobs they didn’t enjoy. “The irony was that talent in a male-typical pursuit limited their choices,” Ms. Pinker says. “Once they showed aptitude for math or physical science, there was an assumption that they’d pursue it as a career even if they had other interests or aspirations. And because these women went along with the program and were perceived by parents and teachers as torch bearers, it was so much more difficult for them to come to terms with the fact that the work made them unhappy.”

Ms. Pinker says that universities and employers should do a better job helping women combine family responsibilities with careers in fields like physics. But she also points out that female physicists are a distinct minority even in Western European countries that offer day care and generous benefits to women.