The mere exposure effect is the psychological phenomenon where people develop a preference for things simply because they are familiar with them — repeated exposure increases liking, independent of any objective evaluation.

The Research

Robert Zajonc's foundational studies showed that subjects exposed to unfamiliar stimuli — words, faces, Chinese characters, geometric shapes — rated them more positively with each repeated exposure, even when they had no conscious memory of having seen them before.

Scale of the Effect

• Songs become more likable with repeated plays (even when initially disliked)
• Brand logos trigger positive affect through pure repetition — the mechanism behind advertising saturation
• Faces seen repeatedly are rated as more attractive and trustworthy
• Foreign words become more preferred the more times they're seen, regardless of meaning

Manipulation Risk

The mere exposure effect is the foundation of propaganda through repetition. Repeated claims — true or false — become more believable simply through frequency of exposure.

Awareness Application

Ask: Do I like this because it's good, or because it's familiar?

Reference:

Wikipedia: Mere-Exposure Effect

https://en.wikipedia.org/wiki/Mere-exposure_effect