The Halo Effect: Thorndike's Army Ratings, Attractive Defendants and Cork

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In 1920 the behaviorist Edward Thorndike named the halo effect after asking military commanding officers to rate their soldiers on physique, neatness and bearing, and separately on intellect, leadership, dependability and loyalty. The correlations were far too high: physique correlated with intelligence at .31 and with leadership at .39. The officers were forming one global judgment of a soldier and coloring every trait to match it. The episode traces the bias through Solomon Asch's 1940s impression study, in which one word, warm or cold, changed how people read an otherwise identical list of traits, and the 1970s beauty-is-good experiments.

From there it follows the halo into courtrooms, classrooms and marketing. Mock jurors gave attractive defendants lighter sentences, except when the crime was a swindle, where attractive defendants were punished more harshly. Companies build halos on purpose: the iPod drove Mac sales, carmakers build halo supercars, and the word organic changes how people say wine tastes. The episode also covers the reverse, the horn effect, and early 1990s research showing how one negative trait or label skewed teachers' ratings of children.

• In the 1970s photo study, students rated attractive strangers higher on 27 traits but predicted they would be worse parents.
• A 2023 study of nearly 3,000 participants found a digital beauty filter made people seem more intelligent, trustworthy and sociable.
• In the mock trial, the theft involved $2,200, taken either by burglary or by luring a man into a fake corporation.
• Surveys cited in the episode show 95% of participants trust the Ronald McDonald House charity on sight.
• Teachers told that a normal child had a learning disorder or emotional disturbance kept negative expectations despite seeing ordinary behavior on video.