“I love the idea of trying to figure out why, when we put on certain clothes, we might more readily take on a role and how that might affect our basic abilities,” said Joshua I. Davis, an assistant professor of psychology at Barnard College and expert on embodied cognition who was not involved with the study. This study does not fully explain how this comes about, he said, but it does suggest that it will be worth exploring various ideas.

There is a huge body of work on embodied cognition, Dr. Galinsky said. The experience of washing your hands is associated with moral purity and ethical judgments. People rate others personally warmer if they hold a hot drink in their hand, and colder if they hold an iced drink. If you carry a heavy clipboard, you will feel more important.

It has long been known that “clothing affects how other people perceive us as well as how we think about ourselves,” Dr. Galinsky said. Other experiments have shown that women who dress in a masculine fashion during a job interview are more likely to be hired, and a teaching assistant who wears formal clothes is perceived as more intelligent than one who dresses more casually.

But the deeper question, the researchers said, is whether the clothing you wear affects your psychological processes. Does your outfit alter how you approach and interact with the world? So Dr. Galinsky and his colleague Hajo Adam conducted three experiments in which the clothes did not vary but their symbolic meaning was manipulated.

In the first, 58 undergraduates were randomly assigned to wear a white lab coat or street clothes. Then they were given a test for selective attention based on their ability to notice incongruities, as when the word “red” appears in the color green. Those who wore the white lab coats made about half as many errors on incongruent trials as those who wore regular clothes.