Jacob Sullum on the recent ebook The Demise of Guys: Why Boys Are Struggling and What We Can Do About It, by Philip G. Zimbardo and Nikita Duncan.

Zimbardo’s thesis is that “boys are struggling” in school and in love because they play video games too much and watch too much porn. But he and his co-author, a recent University of Colorado graduate named Nikita Duncan, never establish that boys are struggling any more nowadays than they were when porn was harder to find and video games were limited to variations on Pong. The data they cite mostly show that girls are doing better than boys, not that boys are doing worse than they did before xvideos.com and Grand Theft Auto. Such an association would by no means be conclusive, but it’s the least you’d expect from a respected social scientist like Zimbardo, who oversaw the famous Stanford “prison experiment” that we all read about in Psych 101.

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One source of evidence that Zimbardo and Duncan rely on heavily, an eight-question survey of people who watched Zimbardo’s TED talk online, is so dubious that anyone with a bachelor’s degree in psychology (such as Duncan), let alone a Ph.D. (such as Zimbardo), should be embarrassed to cite it without a litany of caveats. The most important one: It seems probable that people who are attracted to Zimbardo’s talk, watch it all the way through, and then take the time to fill out his online survey are especially likely to agree with his thesis and especially likely to report problems related to electronic diversions. This is not just a nonrepresentative sample; it’s a sample bound to confirm what Zimbardo thinks he already knows. “We wanted our personal views to be challenged or validated by others interested in the topic,” the authors claim. Mostly validated, to judge by their survey design.

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Other sources of evidence cited by Zimbardo and Duncan are so weak that they have the paradoxical effect of undermining their argument rather than reinforcing it. How do Zimbardo and Duncan know about “the sense of total entitlement that some middle-aged guys feel within their relationships”? Because “a highly educated female colleague alerted us” to this “new phenomenon.” How do they know that “one consequence of teenage boys watching many hours of Internet pornography…is they are beginning to treat their girlfriends like sex objects”? Because of a theory propounded by Daily Mail columnist Penny Marshall. How do they know that “men are as good as their women require them to be”? Because that’s what “one 27-year-old guy we interviewed” said.

Even when more rigorous research is available, Zimbardo and Duncan do not necessarily bother to look it up. How do they know that teenagers “who spend their nights playing video games or texting their friends instead of sleeping are putting themselves at greater risk for gaining unhealthy amounts of weight and becoming obese”? Because an NPR correspondent said so. Likewise, the authors get their information about the drawbacks of the No Child Left Behind Act from a gloss of a RAND Corporation study in a San Francisco Chronicle editorial. This is the level of documentation you’d expect from a mediocre high school student, not a college graduate, let alone a tenured social scientist at a leading university.