The Familiarity Effect: Why a Kept Object Beats a Seen Advert

There is a quiet mechanism behind why people come to prefer brands they have simply encountered a lot, and it is one of the most robustly replicated findings in psychology. It is called the mere exposure effect, and the short version is this: the more often we are exposed to something, the more we tend to like it, even when we have no conscious memory of having seen it before. Familiarity, on its own, breeds preference. For anyone deciding where to put a marketing budget, that has direct and slightly counter-intuitive consequences.

The effect was named and demonstrated by Robert Zajonc in a 1968 paper with the plain title “Attitudinal Effects of Mere Exposure.” He showed people unfamiliar shapes, symbols and faces varying numbers of times, and the ones they had seen more often were rated more favourably, with no logical reason for the preference beyond repetition itself. This was not a one-off. By 1989 the psychologist Robert Bornstein had gathered 208 separate experiments into a meta-analysis and confirmed the effect as reliable and reasonably strong. It was extended specifically to brand names and packaging by Chris Janiszewski in 1993, so this is not a general principle being stretched to fit marketing; the marketing application has been studied in its own right.

The mechanism is worth understanding because it explains why the effect is real rather than magical. Repeated exposure makes a stimulus easier for the brain to process, a quality psychologists call perceptual fluency. That ease produces a faint positive feeling, and the mind, not knowing where the good feeling came from, attributes it to the object itself. We end up thinking “I like this” or “this seems trustworthy” when what we are actually registering is that the thing feels familiar and easy to take in. It is a small effect on each encounter, but encounters accumulate.

This is precisely where a physical branded object has an advantage that a single advertisement cannot match. An advert is one exposure, or a burst of them, and then it is gone. A branded notebook, mug or bag that someone keeps delivers exposure after exposure, day after day, entirely passively. Every time it is picked up, used or simply seen on a desk, another small deposit is made in the familiarity account. That steady drip of repeated contact is exactly the diet the mere exposure effect feeds on, and it is a large part of why kept, useful items outperform disposable ones. It is the thinking that shapes GoPromotional’s branded merchandise range, where the emphasis falls on things people actually want to hold on to.

Now the honest part, because this is where most of the sector stops and where the credibility lies. The mere exposure effect does not run forever. It follows a decelerating curve: the first handful of exposures do most of the work, the benefit typically peaks somewhere around ten to twenty exposures, and after that it can plateau or even decline. Anyone who has heard a favourite song too many times knows the feeling. Repetition that once built affection eventually tips into indifference or irritation. That matters for merchandise because it argues against the crudest logic of “more is always better.” The value is in the item being kept and used, not in bombarding someone until the charm wears off.

Stating that limit is not a weakness in the argument; it is what separates understanding from cheerleading. A supplier who tells you an item will build familiarity indefinitely is either unaware of the research or ignoring it. The realistic claim is more useful: a well-chosen item that earns a place in someone’s daily routine delivers exposures in exactly the range where the effect is strongest, and it does so at a cost per exposure that conventional media struggles to approach. The ASI Global Advertising Impressions Study, in its 2026/2027 edition, put the average promotional product at around 3,300 lifetime brand impressions at an average cost of six tenths of a cent per impression. That figure is the mere exposure effect made economic: a kept object generating repeated contact, cheaply, over its whole life.

There is a design implication in all of this. If the mechanism depends on the item being kept and encountered repeatedly, then usefulness is not a nice-to-have; it is the whole game. An item that gets binned delivers a single exposure and then nothing. An item that becomes part of someone’s desk, bag or morning routine delivers hundreds. The choice of product, its quality, and how well it fits the recipient’s actual life are therefore not cosmetic decisions. They determine whether the psychology gets a chance to work at all.

The practical conclusion is straightforward. Familiarity genuinely builds preference, the research on this is deep and settled, and physical merchandise is unusually well suited to delivering the repeated, low-cost exposures the effect requires. But the benefit lives in the middle of a curve, not at its extremes. Choose items people keep, aim for the exposures that matter most, and do not mistake volume for value. Do that, and you are working with one of the sturdiest findings psychology has to offer rather than against it.