mere-exposure effect: a standalone construct

Robert Zajonc's 1968 monograph Attitudinal effects of mere exposure named and demonstrated the effect that repeated exposure to a stimulus, whether a word, a face, a shape, or a melody, increases a person's liking for it, even when the person has no memory of having seen it before and nothing else about the stimulus changes. The word mere marks the claim: exposure alone, with no reward, no new information, and no conscious recognition required, is enough to shift affect, the felt positive or negative response toward the object. Robert Bornstein's 1989 meta-analysis of two decades of studies found the effect robust across stimuli and populations and often strongest when exposures are brief and not consciously registered, and Zajonc's 2001 review positioned it as evidence that a preference can form before, and independently of, deliberate thought. What makes the effect a landmark is its reach: it ties a minimal, purely perceptual manipulation, the number of times something is shown, to a downstream change in attitude and choice, and it holds even when the repeated stimuli are presented too briefly for the viewer to identify them.[1][2][3]

Unit

A change in rated liking or preference produced by repetition of exposure, with no other change to the stimulus

Recovery means

Not applicable

Measured by

Measured by comparing rated liking, preference, or choice for repeatedly presented stimuli against novel ones at matched exposure frequencies, often using brief or subliminal presentations to rule out deliberate recognition