Oddly Wired
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preference

Simply seeing something repeatedly makes you like it more.

The mere exposure effect dictates that your preference for a stimulus increases with the frequency of your encounters with it.

A 1968 study found that participants rated nonsense words or abstract symbols significantly more positively after they had been exposed to them more often in a list.

Familiarity is often confused with genuine preference.

Where this comes from

Study
Zajonc, 1968
What the check found
Zajonc's 1968 study is the definitive source for this, though the claim omits the critical nuance that the effect plateaus and can reverse with excessive repetition.
Confidence
Well replicated

Related

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