The Halo Effect

Cognitive biases are psychological phenomena that distort our perceptions, memory, or judgment. When success depends on accurate perception, evaluation, or recollection of what's around us, distortions can lead to erroneous results that range from harmless to catastrophic.

The Halo Effect (or Halo Error) was first identified in 1920 by Edward Thorndike, who was studying how military officers evaluated their subordinates [Thorndike 1920]. He found that high (low) ratings in one attribute tended to be correlated with high (low) ratings in other seemingly unrelated attributes. But the effect is universal, extending beyond military performance evaluation. In modern experiments, for example, researchers have demonstrated that people tend to judge physically attractive people as possessing more socially desirable personality traits than do less physically attractive people. Thus physical traits bias our assessment of personality traits.

In the context of performance reviews, researchers have demonstrated that when evaluators perceive in subordinates attributes that they regard as negative, those evaluators tend to assess more negatively the unrelated attributes of those subordinates.

The Halo Effect is pervasive. Here are three examples of how it can affect organizational decision-making.

Status affects persuasiveness

Assessments of the validity of someone's assertions can be affected by our perception of her or his status. For instance, when supervisors attend meetings of their subordinates, their statements tend to have greater weight than they deserve. And when pariahs speak, listeners are more likely to discount what is said than when superstars deliver essentially the same message.

The effects of status are wide-ranging. For instance, someone mentored by a high-status individual can acquire some of the elevated status of the mentor. See "Dispersed Teams and Latent Communications," Point Lookout for September 3, 2003, for more.

Falsifying an argument falsifies the assertion

When we assess the truth of an assertion, we examine the argument that justifies it. In the course of that examination, if we find a flaw in the argument, we sometimes conclude that the assertion is false. The assertion might indeed be false, but finding a flaw in a supposed proof of the assertion doesn't prove that the assertion is false.

This error is a rhetorical fallacy known as argumentum ad logicam, the fallacy fallacy, or the fallacist's fallacy. It's a manifestation of the halo effect in the realm of logic.

Hat hanging

Hat hanging is a phenomenon identified by Virginia Satir, a pioneer family therapist. When pariahs speak, listeners are
more likely to discount what is
said than when superstars deliver
essentially the same messageThe name evokes the idea that we hang the hat of someone from our past on someone in our present. For example, life can be difficult for someone whose appearance matches the appearance of a film actor who often plays villains. It's a manifestation of the halo effect in the realm of personal identification.

Hat hanging can occur in supervisor-subordinate pairs when age differences approximate parent-child age differences. See "You Remind Me of Helen Hunt," Point Lookout for June 6, 2001, for more.

Recognizing the Halo Effect in oneself is difficult. Practice by recognizing it in others.  Top    Next Issue

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Footnotes

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Related articles

More articles on Critical Thinking at Work:

Mudfights

When we steer the discussion away from issues to attack the credibility, motives, or character of our debate partners, we often resort to a technique known as the ad hominem attack. It's unfair, it's unethical, and it leads to bad, expensive decisions that we'll probably regret.

Interviewing the Willing: Strategy

At times, we need information from each other. For example, we want to learn about how someone approached a similar problem, or we must interview someone about system requirements. Yet, even when the source is willing, we sometimes fail to expose critical facts. How can we elicit information from the willing more effectively?

An Emergency Toolkit

You've just had some bad news at work, and you're angry or really upset. Maybe you feel like the target of a vicious insult or the victim of a serious injustice. You have work to do, and you want to respond, but you must first regain your composure. What can you do to calm down and start feeling better?

The Nominal Fallacy at Work

Using logical fallacies at work — intentionally or otherwise — costs real money. The nominal fallacy is probably responsible for much delay in addressing our real problems.

Still More Things I've Learned Along the Way

When I have an important insight, or when I'm taught a lesson, I write it down. Here's another batch from my personal collection.

See also Critical Thinking at Work and Rhetorical Fallacies for more related articles.

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And on July 4: Interrupting Others in Meetings Safely: II

When we feel the need to interrupt someone who's speaking in a meeting, to offer a view or information, we would do well to consider (and mitigate) the risk of giving offense. Here are some techniques for interrupting the speaker in situations not addressed by the meeting's formal process. Available here and by RSS on July 4.

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