The halo effect guide

The halo effect is a cognitive bias in which one positive impression of a person—often physical attractiveness—leads you to assume they have other positive qualities, like intelligence, honesty, or competence. A single trait casts a “halo” over everything else, distorting judgment in workplaces, schools, and everyday settings.

In this guide, we’ll explore how the halo effect works, why it can harm areas like user experience, and how to overcome its effects.

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What is the halo effect?

At its simplest, the halo effect means judging people by their appearance. More specifically, it’s the tendency to assume someone you find attractive also possesses other desirable qualities like honesty, competence, or character.

The concept is simple, but its consequences can be far-reaching and often harmful.

Why is it called the halo effect?

Halos appear in traditional religious art as a disk or circle of light hovering over the head of a saint or other holy figure. The halo effect occurs when people place metaphoric halos over others, usually for superficial reasons.

History of the halo effect

The term isn’t new. Psychologist Edward Thorndike coined it in a 1920 paper entitled A Constant Error in Psychological Ratings.

Thorndike’s original study was broader than attractiveness alone. He asked military officers to rate soldiers on a variety of qualities and found that a high rating in one area carried over into other areas.

Someone who scores highly in one area—whether attractiveness, intelligence, athleticism, or competence in a particular field—is often presumed to have other positive qualities. In practice, though, the halo effect tends to center on physical appearance, which is why it’s sometimes called the “physical attractiveness stereotype.”

Where and when does this bias occur?

The halo effect may be a factor in the following areas:

Workplaces

The halo effect can have serious ramifications in the workplace if people are treated differently based on their appearance—for example, when a worker considered more attractive is promoted or paid more than their co-workers without deserving it.

Education

Teaching staff may be influenced by the halo effect at every education level, from kindergarten to graduate and professional university programs.

They may, consciously or not, consider students they find more attractive to be smarter and more competent. This assumption can affect grades as well as the overall attitude teaching staff have toward students.

The halo effect can also run in the opposite direction here, such as in student evaluations of professors.

It may also factor into teachers, professors, and administrators attaining higher status, promotions, or tenure. In Felicia Nimue Ackerman’s essay, The Halo Effect in Academia, the author relates how hero worship of renowned professors can interfere with objective thinking.

Advertising and marketing

The halo effect can make people trust attractive, glamorous figures on matters where they have little expertise.

This goes back to the early days of television, when celebrities were hired as spokespeople for products in commercials. Today’s social media influencers benefit from the same effect.

Websites and social media

Individuals and organizations may consciously or unconsciously use images considered more eye-catching and persuasive on websites and social media.

An easy way to see evidence of this is to browse any stock photo site. The photos featuring people usually display those considered attractive and glamorous.

Politics

Politics is another area where the halo effect can have undesirable consequences. People may judge a candidate or elected official based on their appearance.

An attractive person isn’t necessarily honest or a good leader. People may also mistake other desirable qualities, such as being well-spoken and articulate, for intelligence or integrity.

The courts and legal system

Justice is supposed to be impartial. But judges and jury members are human, and the halo effect can sway them.

A defendant with an attractive, well-groomed appearance may be judged less harshly than someone who appears rougher around the edges. There’s a good reason attorneys have their clients dress in their best suits—even clients who never normally wear them. Beyond jury verdicts, the halo effect may also influence a judge when passing a sentence.

Social interactions

The halo effect doesn’t only apply to institutions and professional settings. It can influence how people treat acquaintances, co-workers, fellow students, or strangers at a party, meeting, or public place.

What causes the halo effect?

The halo effect is a complex mechanism that occurs for several reasons. Psychologists hold different theories on the subject, but studies have produced some solid conclusions.

Cognitive bias

Cognitive bias refers to errors in thinking based on unconscious oversimplifications. There are several types:

Confirmation bias is the tendency to interpret current facts in a way that conforms to pre-existing beliefs—beliefs you picked up from your parents, peers, something you read, or anywhere else.

Hindsight bias occurs when past events are interpreted as predictable based on current information. A common example is financial experts explaining why markets went up or down after the fact.

Self-serving bias is the tendency to interpret reality in a way that serves your own interests. People tend to attribute positive outcomes to personal qualities and negative outcomes to bad luck or the actions of others. A related phenomenon is group-serving bias, where the same tendency applies to a group.

These and other variations of cognitive bias can contribute to and reinforce the halo effect. If you consider someone physically attractive, you’re more likely to attribute their success to competence and their failures to bad luck—especially if the person belongs to your team (group-serving bias).

The horn effect

The horn effect is related to the halo effect but works in the opposite way.

With the horn effect, a negative characteristic is generalized to reflect poorly on an individual. For example, you might unjustifiably assume a less attractive person is unintelligent or untrustworthy.

This works with other characteristics, too. If you see evidence that someone performs poorly at a certain task, you may assume they’re incompetent in general.

Both the halo effect and horn effect involve generalizing. Most people are a complex combination of positive and negative traits, but it’s easy to look at one aspect of a person and form a distorted big picture.

How to avoid the halo effect

The halo effect (along with the horn effect) is a natural tendency driven by largely unconscious cognitive bias. But once you’re aware of it, you can take steps to avoid or at least downplay its influence.

Awareness and behavior changes

The most insidious thing about the halo effect is that it’s unconscious. It shapes attitudes and behaviors without people noticing.

The first step in preventing the halo effect is knowing it exists. Knowing about it isn’t sufficient on its own, though—you need to take deliberate action to minimize its influence. Remind yourself that your attitudes and assumptions about people aren’t always trustworthy. Everyone has cognitive biases that may cause them to prejudge people unfairly.

It often helps to observe your initial impressions and assumptions about others, then ask yourself whether your conclusions are warranted. Consult someone you trust, and where possible, verify your assumptions against hard evidence.

For example, if you’re a hiring manager, you may be initially impressed by the way a candidate expresses themselves and conclude they’re ideal for the position. Going over their resume or contacting a former employer gives you a broader perspective for a more informed decision.

Educating employees and team members

Organizations should address the halo effect, too. Business owners, managers, school officials, and anyone in a position of authority should educate their peers and employees about the halo effect and how to combat it.

Raise the topic in meetings, organizational newsletters, and other communication channels. The halo effect is pervasive, so people need periodic reminders.

Use a competency and skills-based approach

The antidote to the halo effect is basing recruitment, hiring, promotion, or grading on skills and competency rather than subjective factors like appearance or personality. This could look like:

• Administering skill assessment tests for hiring
• Basing promotions and raises on quantifiable accomplishments
• Grading students on objective criteria, such as exam performance

You can’t make every assessment perfectly objective, but a strong foundation of objective criteria gives the halo effect far less room to operate.

The halo effect can’t be eliminated, but it can be minimized

The halo effect is rooted in cognitive bias, so completely eliminating it is unlikely. But once you recognize it exists—and that its consequences can be harmful—you can take steps to minimize it.

As individuals, we can question our impulses to judge others superficially or generalize their positive (or negative) features. Organizations can educate employees and members to stay on guard for the halo effect and adopt methods for avoiding it.