Oddly Wired
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preference

You prefer things simply because you have seen them before.

Repeated exposure to an item generally increases liking up to an optimal point, after which boredom or habituation typically causes liking to decrease.

The mere-exposure effect follows an inverted-U curve rather than a simple upward trajectory.

Preference is often just a byproduct of recognition.

Where this comes from

Study
Zajonc, 1968
What the check found
While Zajonc (1968) did establish the mere-exposure effect, the claim implies a linear increase in liking that persists indefinitely, ignoring the well-documented habituation/boredom phase.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.