Psychologists have been studying the art of persuasion for nearly a century, analyzing activities like political propaganda, television campaigns and door-to-door sales. Many factors influence people’s susceptibility to an appeal, studies suggest, including their perception of how exclusive an opportunity is and whether their neighbors are buying it.

They have found that immediate social bonding between strangers is highly dependent on mimicry, a synchronized and usually unconscious give and take of words and gestures that creates a current of good will between two people.

By understanding exactly how this process works, researchers say, people can better catch themselves when falling for an artful pitch, and even sharpen their own social skills in ways they may not have tried before.