Exposure effect

Exposure effect is a psychological phenomenon well known to advertisers: people express undue liking for things merely because they are familiar with them. This effect has been nicknamed the "familiarity breeds liking" effect. In interpersonal attractiveness research studies, the term exposure principle is used to characterize the phenomenon in which the more often a person is seen by someone the more pleasing and likeable that person appears to be.

Simply exposing experimental subjects to a picture or a piece of music briefly led those subjects to later rate it more positively than other, similar stimuli which they had merely not been shown earlier. In another experiment, students were shown a Chinese character on a tachistoscope faster than could be perceived consciously. Later, students were asked to say whether they thought specific characters were positive or negative adjectives. Those characters that had been previously subliminally exposed to the students were rated more positively than those that had not. When asked, the students were able to cite specific and detailed reasons why they preferred the characters that they did (which could have been at least partially due to rationalization).

The effect might be explained by the idea that recognizing a familiar environment makes us feel safe. This effect was first studied by Robert Zajonc. A related effect relevant to advertising and propaganda is the sleeper effect.

The exposure effect has recently been demonstrated by Fang et. el. (2007) in the context of web site banner advertising.