What might be a purpose of the mere exposure effect from an evolutionary perspective?

To avoid unfamiliar and possibly dangerous stimuli.

Explanation:

The mere exposure effect is a psychological phenomenon by which we usually reveal an inclination for things simply because they are known to us. It refers to a situation in which a certain stimulus has been available to a subject’s perception, either consciously or subconsciously.

It was first proven by the Polish-born psychologist Robert Zajonc, who performed a seminal experiment in 1968.

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