The Mere-Exposure Effect: Why Familiarity Breeds Liking

What Is the Mere-Exposure Effect?

The mere-exposure effect (also called the familiarity effect) describes a simple relationship: merely perceiving someone repeatedly increases how much we like them. First systematically demonstrated by Zajonc (1968), it is among the most cited findings in social psychology.

Bornstein (1989) confirmed the effect in a meta-analysis across various stimulus types. Fehr (2008) classifies it as a situational factor in friendship formation, closely intertwined with the proximity effect: physical nearness works partly because it generates repeated contact.

Zajonc’s Experiment

In his famous experiment, Zajonc showed participants Chinese characters — some frequently, others rarely. Afterwards, participants rated the frequently shown characters as more pleasant— even though they did not know their meaning.

The effect extends to people: children are more likely to befriend classmates they know from previous classes (Gifford-Smith & Brownell, 2001). Navy recruits preferred former bunkmates during leisure time — even if they had not been close friends there (Skyes, 1983). Familiarity alone was enough to create attraction.

When the Effect Does Not Work

The most important limitation: when the initial perception is negative, repeated contact can actually intensifythe dislike rather than soften it (Perlman & Oskamp, 1971).

If you find someone unlikeable at first meeting, seeing them more often will not make you warm to them — quite the opposite. The mere-exposure effect only works when there is no initial aversion. This explains why some neighbors or colleagues never become friends despite daily contact.

The Denrell Asymmetry

Denrell (2005) described a related mechanism: negative first impressions are corrected less often than positive ones. The reason is straightforward: if you find someone unlikeable at first meeting, you avoid future encounters — and thus have no chance to change your mind.

Positive first impressions, on the other hand, lead to more contact, which further reinforces liking (mere exposure). The result: a systematic bias toward positive evaluations — and a hardening of negative ones. For friendship formation, this means: the first impression matters more than we think.

Mere Exposure in Everyday Life

The effect explains many everyday observations: why we eventually warm to the barista we see daily, why new colleagues feel less “foreign” after a few weeks, why regular course participants form friendships more easily than one-time visitors.

The practical takeaway: if you want to make new friends, you need to regularlyexpose yourself to the same people — in the same club, the same running group, the same class. One-off meetings are not enough. The mere-exposure effect needs repetition. More on this in our article about friends at work and school.

Frequently Asked Questions

What is the mere-exposure effect?

A social-psychological effect: the more often we encounter someone, the more we like them — even without direct interaction. First systematically demonstrated by Zajonc (1968) and confirmed by hundreds of studies (Bornstein, 1989).

Why do familiar people become likeable?

The exact mechanism is not fully settled. Two explanations are discussed: familiarity itself may be pleasant, or it reduces uncertainty — and less uncertainty feels comfortable.

Does the effect always work?

No. When the initial perception is negative, repeated contact can even intensify the dislike. The effect only works when there is no initial aversion (Perlman & Oskamp, 1971).

Can a bad first impression be corrected?

Rarely. Denrell (2005) described an asymmetry: negative first impressions are corrected less often than positive ones, because further contact is avoided. If you find someone unlikeable at first meeting, you avoid future encounters — and thus have no chance to change your mind.