Halo Effect

What is it?

The halo effect, first identified by psychologist Edward Thorndike in 1920, is a cognitive bias where our impression of someone in one area influences our opinion of them in other, unrelated areas. If we perceive someone positively in one domain (attractive, intelligent, friendly), we tend to assume they have other positive qualities as well, creating a "halo" around them. The effect also works in reverse: the "horn effect" leads us to assume negative traits from a single negative impression. In a classic 1972 study, Dion, Berscheid, and Walster found that people judged physically attractive strangers, from a photo alone, to have more desirable personalities and more successful lives. In hiring, a prestigious university or famous former employer can raise ratings on skills the credential says nothing about. The halo effect distorts performance reviews, where one strong characteristic overshadows weaknesses, and marketing uses it through attractive or admired spokespeople. Some studies have even found more lenient treatment of attractive defendants. Breaking the halo effect means evaluating each attribute separately and seeking evidence that contradicts your overall impression.