#240: Halo Effect, Horn Effect & the Contrast Effect
3 Ideas in 2 Minutes on Judgement Biases (The story of Ben)
I. Halo Effect
Alan: intelligent — industrious — impulsive — critical — stubborn — envious
Ben: envious — stubborn — critical — impulsive — industrious — intelligent
Who would you consider more likable? Alan or Ben? As this example by famous psychologist Solomon Asch demonstrates, our judgments often depend on the traits we initially associate with someone.
This is due to the Halo Effect, which causes our initial impression to shape how all other traits are perceived. Daniel Kahneman, the author of Thinking, Fast and Slow, refers to it as exaggerated emotional coherence. An initial positive opinion about one characteristic may lead us to also judge the same person positively in a different area:
The stubborness of an intelligent person is seen as likely to be justified and may actually evoke respect, but intelligence in an envious and stubborn person makes him more dangerous.
—Daniel Kahneman
That’s why Alan seems so easy to get along with. Not like that envious prick Ben, who has all the same traits, just in reverse.
II. Horn Effect
Ben is also judged by his colleagues through a Horn Effect lens, because negative impressions do the same in the opposite direction. A single notable negative trait can taint our opinion about someone entirely. One visible failure, let’s say Ben making negative remarks about Peter’s promotion, is treated as diagnostic of his character.
An awkward first interaction causes someone to be judged as unintelligent, unreliable or unpleasant in general. Subsequent neutral or positive behaviour is discounted or reinterpreted to fit the negative frame.
The Horn Effect is especially devastating in hierarchical systems. Once a negative label is attached, scrutiny increases, errors are remembered and successes are minimised. Ben’s trapped in a self-reinforcing loop that is difficult to escape.
III. Contrast Effect
Ben’s perceived character can also be influenced by the Contrast Effect. This occurs when our judgment of someone is shaped by comparing them to others, rather than by their traits alone. Ben might seem worse or better depending on who we evaluate him against.
For example, if Ben is introduced immediately after a highly competent and friendly colleague, his envious or critical traits may appear even more pronounced. Conversely, if he follows someone rude or careless, the same behaviour may seem less negative, or even relatively acceptable. Truth be told, that never happens to poor Ben.
The contrast effect highlights that our impressions are not formed in isolation. Perception depends on context. Ben’s reputation can shift dramatically simply based on who else is present at the time. 🐘
Have a great week,
Chris
themindcollection.com
P.S.: Ben has since landed a high-paying job at a behavioural research lab specialising in bias and decision-making. He’s admired by everyone and lives a quiet life with his wife and three kids on a vineyard in Southern France.