For something intangible, a glance can be a powerful thing. It can carry the weight of culture and history, it can cause psychological harm, and it can act as a muzzle. Consider the relatively simple act of a man staring at a woman's body. This is such a common part of modern society that most of us rarely stop to think of its consequences, much less investigate it with a scientific lens.
Tamar Saguy is different. Leading a team of Israeli and US psychologists, she has shown that women become more silent if they think that men are focusing on their bodies. They showed that women who were asked to introduce themselves to an anonymous male partner spent far less time talking about themselves if they believed that their bodies were being checked out. Men had no such problem. Nor, for that matter, did women if they thought they were being inspected by another woman.
Saguy's study is one of the first to provide evidence of the social harms of sexual objectification - the act of treating people as "de-personalised objects of desire instead of as individuals with complex personalities". It targets women more often than men. It's apparent in magazine covers showing a woman in a sexually enticing pose, in inappropriate comments about a colleague's appearance, and in unsolicited looks at body parts. These looks were what Saguy focused on
Saguy found that women talked about themselves for less time than men, but only if they thought they were being visually inspected by a man, and particularly if they thought their bodies were being checked out. They used the full two minutes if they were describing themselves to another woman (no matter where the camera was pointing) or if they were speaking to a man who could hear but not see them. But if their partner was a man watching their bodies, they spoke for just under one-and-a-half minutes.
Men had no such qualms. They used the full two minutes regardless of whether they were being watched or listened to, and no matter the gender of their partner. The fact that men didn't react in the same way is important. For a start, it shows that it's a man's gaze and not just any downward glance that affects a woman's behaviour. It also puts paid to the false equivalence arguments that are often put forward when discussing gender issues (i.e. "women look at male bodies too").
For the rest, with graphics and graphs.