The Barnum Effect: Ego Beats Self-Reflection – and How You Can Use It

A UX designer should usually know their users very well. And of course, I know a lot about my users, too. The typical UX Fox reader can be described quite accurately like this:

Toward other people, you are sometimes extroverted and open, but at other times introverted and reserved. Most people only know you superficially. You have abilities that you don't fully make use of. Every now and then, you tend to doubt whether your decisions were right. Your job matters to you, and you place a lot of value on good relationships.

Did you recognize yourself in that description? That's no coincidence, because this description applies to 95%

of all people. So the fact that you recognized yourself in it, partly or even completely, says nothing about how much I know about you. Horoscopes work exactly the same way. The statements they use apply fully, or at least partially, to almost everyone. The wording is fuzzy and full of "often," "tend to," "sometimes," and "every now and then." That makes it almost impossible to be completely wrong with a profile like this. This phenomenon is known as the Barnum effect.

The Barnum Effect

The term goes back to the American circus pioneer Phineas Taylor Barnum. In the mid-19th century, Barnum's American Museum opened in New York. Barnum's idea was to show the widest possible variety of attractions, shows, and exhibitions. That's where the core idea comes from: "There's something for everyone!"

However, the Barnum effect only became popular under this name about a century later, thanks to the American psychologist Paul Meehl. He gave the Forer effect, also known as the fallacy of personal validation, a new name.

The American psychologist Bertram R. Forer developed a test to study the fallacy of personal validation:

He asked students to fill out a personality test and, a short time later, sent each participant an evaluation. The students' second task: rate on a scale from 0 to 5 how accurately the evaluation described their own personality.

With an average score well above 4 points, the vast majority of students found the test very fitting and accurate. What the students didn't know: the "evaluation" they received wasn't based on any scientific findings at all – Forer had cobbled it together himself from various horoscopes.

With this, Forer succeeded in showing that people tend to accept general, vague claims about themselves as accurate and to recognize themselves in them.

The results of Forer's study were confirmed by other scientists in similar experiments.

Barnum Statements:

The main drivers of the Barnum effect are so-called Barnum statements. These statements are vague and general, which is why almost everyone can identify with them. Barnum statements can be created using various tools:

1. Desirable, positive traits:Most people would immediately agree with a sentence like "You are a lovable and at the same time determined person." We want to see these traits in ourselves, even if in reality we are neither lovable nor determined.
2. Common fears and worries:Many fears are so universal that a statement about them can practically never be wrong: "Your health is very important to you!" Who wouldn't say yes to that?
3. Vague statements:"You are determined, but you choose the goals you pursue very carefully." This statement sounds like a deep analysis of the psyche, but it simply covers every possible degree of determination. Whether you chase big goals with motivation and commitment or you're stuck in place: you'll always find yourself in this Barnum statement.
4. Tendency toward the middle:"Only a Sith deals in absolutes!" Even Obi-Wan Kenobi knew a thing or two about the nature of the human psyche. Most people simply don't feel at home in extremes. Most people would probably agree with a sentence like "Toward other people, you are sometimes extroverted and open, but at other times introverted and reserved."

Why Is the Barnum Effect So Effective?

Why is the Barnum effect so effective that so many people simply fall for it? There are actually at least two psychological phenomena at play:

Selective Perception:

Put simply: people see what they want to see. When a horoscope or personality test promises to reveal your personality, you'll focus on the points that actually match you, at least roughly. Points that fit less well aren't actively noticed and play practically no role in your assessment.

Confirmation Bias:

Vague information is interpreted in a way that fits your own worldview, meaning your own views and expectations. "You are a reliable person!" Automatically, you feel well described. Whether the statement is even true is no longer questioned.

The Barnum Effect in UX and Conversion Optimization

Here's one possible example of how the Barnum effect could be used deliberately at the end of a sales conversation:

"I now have a very good impression of you and your company: you're a very down-to-earth but also committed entrepreneur. Your company matters a great deal to you, and you're afraid that success might dry up in the future. You reflect on your own actions, but you always keep your eyes on the future. You're a trustworthy and courteous businessperson, and you expect the same from your business partners. The way I see it, we're on the same wavelength."

These statements are extremely vague and imprecise, which makes them impossible to falsify. Statements like "a very down-to-earth but also committed entrepreneur" or "You reflect on your own actions, but you always keep your eyes on the future" are positive statements that anyone would confirm without thinking twice. The statement "You're a trustworthy and courteous businessperson, and you expect the same from your business partners" makes two positive claims about the person, which, of course, are again confirmed without reflection. At the same time, by applying the priming effect, the person has been primed for positive traits. By tying it all together with the sentence "The way I see it, we're on the same wavelength," all the positive traits the other person has already confirmed are transferred to you. The other person perceives all these statements as accurate. As a result, they get the impression that you listen very attentively and respond very well to them (and their company). This positive trait, in turn, outshines all your other traits. That gives you a kind of "halo".