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How Many Seconds to a First Impression?
You'll never get a second chance to make a great first impression." We've all heard that an interviewer, or a stranger at a party, will form an impression of you, your character, your personality — …

A series of experiments by Princeton psychologists Janine Willis and Alexander Todorov reveal that all it takes is a tenth of a second to form an impression of a stranger from their face, and that longer exposures don’t significantly alter those impressions (although they might boost your confidence in your judgments). Their research is presented in their article “First Impressions,” in the July issue of Psychological Science.
Like it or not, judgments based on facial appearance play a powerful role in how we treat others, and how we get treated. Psychologists have long known that attractive people get better outcomes in practically all walks of life. People with “mature” faces receive more severe judicial outcomes than “baby-faced” people. And having a face that looks competent (as opposed to trustworthy or likeable) may matter a lot in whether a person gets elected to public office.
Willis and Todorov conducted separate experiments to study judgments from facial appearance, each focusing on a different trait: attractiveness, likeability, competence, trustworthiness, and aggressiveness. Participants were shown photographs of unfamiliar faces for 100 milliseconds (1/10 of a second), 500 milliseconds (half a second), or 1,000 milliseconds (a full second), and were immediately asked to judge the faces for the trait in question (e.g., “Is this person competent?”). Response time was measured. Participants were then asked to rate their confidence in making their judgments.
People will make their impression of you in the blink of an eye, and you can't do anything to change that impression later. There are no second chances on first impressions. Your looks impact your life. Well, at least I have 1/10th of a second to show that I'm a feminist with a wonderful personality. Or not...For all five of the traits studied, judgments made after the briefest exposure (1/10 of a second) were highly correlated with judgments made without time constraints; and increased exposure time (1/2 or a full second) didn’t increase the correlation. Response times also revealed that participants made their judgments as quickly (if not more quickly) after seeing a face for 1/10 of a second as they did if given a longer glimpse.
But before you rest secure in the knowledge that at least you have a whole 1/10 of a second to make that great first impression at your next job interview, the authors acknowledge that future research may well close that window even smaller.