The mere exposure effect can result in suboptimal decision-making. Good decisions are made by evaluating all possible courses of actions based on their effectiveness, not their familiarity. When deciding between alternatives, we shouldn’t be choosing the familiar option, we should be choosing the best option. This is because sometimes the best option is not the most familiar one. Sometimes the most effective course of action is the one that is unfamiliar to us. Moreover, sticking with what we know limits our exposure to new things, ideas, and viewpoints. This limits the range of choices we are able and willing to consider when making future decisions, and narrows the perspective from which we make them.

Take the hypothetical example above. Although Jane was satisfied with her choice to eat pizza, she could have gotten much more out of trying a new ethnic dish. She may not only have loved eating a Portuguese meal, but she would have been exposed to the gastronomy of a new culture — a valuable new experience that could have enriched her understanding of food and Portuguese culture.

When this effect is expanded in a societal or institutional setting, the consequences can be more serious. A company that favors its current business model simply because management has grown familiar with it may miss out on necessary organizational and technological changes that require venturing into uncharted waters. A government that is reluctant to deviate from ‘the way things have always been done,’ may not effectively represent the new and evolving preferences of their electorate. Likewise, academic disciplines that have been built around certain schools of thought may miss out on the useful conclusions that dissenting theories point to.

This cognitive bias may also help create social norms and reinforce social stereotypes. According to the mere exposure effect, we are more likely to adopt ideas that we are repeatedly exposed to. We are repeatedly exposed to ideas in the media that support social norms and stereotypes. This can facilitate our own adoption of these ideas, which can sometimes be harmful. A 2008 study found that exposure to faces of an Asian ethnicity led participants to develop positive attitudes towards other Asian faces shown to them. This indicates that the amount and nature of exposure different ethnicities receive influences their popular perception in society. It is commonly understood that minority populations are shown less in western media, and are often shown in ways that support racial prejudice.

…simple interventions, such as showing more racial minority faces on television and public billboards, could enhance White people’s initial evaluative reactions toward unknown members of racial outgroups as well as positive behavioral responses toward newly encountered individuals of that race.”

– Social psychologist Leslie Zebrowitz, et al.

So, the mere exposure effect may entrench institutional and societal norms— which sometimes need to be revised or deviated from. Unfortunately, the mere exposure effect dictates that decision-makers within institutions and society come to prefer these values and ways of doing things because they are familiar.

We don’t need to be aware of the things we are exposed to for their familiarity to have an effect on our preferences towards them. Most of the time, the mere exposure effect happens subliminally, or at a subconscious level. In fact, researchers have found that the effect is more powerful when we are unaware of a stimulus.

There are two main reasons why we experience the mere exposure effect:

1. It reduces uncertainty. We are less uncertain about something when we are familiar with it. We are programmed by evolution to be careful around new things because they could pose a danger to us. As we see something repeatedly without noticing bad consequences, we are led to believe it is safe. Imagine you are a caveman, and encounter two fruits: one that you’ve seen before, and one that you haven’t. Which are you more likely to eat? The cavemen who picked the bush they hadn’t seen before tended not to survive as long (for obvious reasons). We have therefore evolved to have more positive feelings about people and things we have seen before than those we haven’t seen before.
2. It makes understanding and interpreting easier. In what’s known as “perceptual fluency,” we are better able to understand and interpret things we have already seen before. Consider this: for most of us, movies with complicated storylines are usually easier to understand the second time we watch them. This is because the plot and characters are familiar, which reduces the amount of new information your brain needs to process. Our mind generally looks for the path of least resistance, and so we prefer stimuli that we have already been exposed to.

We should seek to avoid the mere exposure effect because it can make us miss out on valuable information and opportunities that we have never seen before. This effect attracts us to the familiar, and as mentioned before, familiarity isn’t a good basis to evaluate things. Sometimes the new option is indeed the best option. Prioritizing the familiar prevents us from venturing into these uncharted waters. This can cause us to make under informed decisions, and prevent us from seizing new opportunities. Speaking to the former, picture citizens who vote for politicians that they recognize from campaign ads and media coverage, rather than candidates that represent their interests. Addressing the latter, imagine an investor who decides against supporting a cutting-edge technology because they are used to its predecessor.

The upshot, is this effect can make us more narrow-minded and prevent personal growth. Sticking to what we know and see on a regular basis prevents us from being open to new views and from putting ourselves in the uncomfortable, unfamiliar situations that force us to become better.

While it is inevitable that we develop an attachment to things we often see, the mere exposure effect may eventually counteract itself. Research has shown that repeated exposure that is sustained may limit and then detract from our attraction to a stimulus as it loses novelty. We can actually start to avoid something if we are exposed too much to it. A 1990 study identifies this as “boredom” with the stimulus.⁵ This makes sense: you often start by liking a song, and often come to love it as you become more familiar with its sound. But if you listen to the song too much, you become bored of it and don’t want to listen to it anymore. A more proactive strategy might be to recognize the value of diversity and new experience. By looking for unfamiliar and different experiences, we might limit how often we are exposed to any one stimulus.

The earliest scientific recordings of the effect came from the work of German psychologist Gustav Fechner, and English psychologist Edward Titchener at the end of the 19th century, who wrote of a “glow of warmth” felt in the presence of something that is familiar. The effect was more thoroughly investigated by an American social psychologist called Robert Zajonc in 1968. In his experiments, Zajonc tested how subjects responded to made-up words and Chinese characters. Subjects were shown the characters a different number of times, and were then tested on their attitudes towards them. Zajonc found that subjects who we shown these words the most also  responded the most favourably to them.

Financial professions may be particularly impacted by the mere exposure effect. A 2015 study done by economist Gur Huberman found that financial traders were more likely to invest in domestic companies they were familiar with, even though this is not the most profitable or risk-averse strategy.

To avoid the damages of a national economic downturn, investors generally agree on the tactic of international diversification. In other words, it is wise to spread investment across companies located in different countries in case one of those countries has economic issues. There is the added benefit of many foreign stocks also being highly profitable.

Despite this, Huberman notes that “by and large, investors’ money stays in their home countries.” This is in the face of falling barriers to international investment. He argues that this “home country bias” can be attributed to “people simply prefer[ing] to invest in the familiar.” Investing in the familiar extends further: people are also more likely to invest in companies they recognize from positive media coverage or their own company’s stocks. The mere exposure effect may therefore cause investors to unwisely favour familiar domestic stocks over unfamiliar foreign ones.

Familiarity is associated with a general sense of comfort with the known and discomfort with—even distaste for and fear of—the alien and distant.”

– Economist Gur Huberman

The mere exposure effect is also present in academia. A study done in 2010 by Alexander Serenko and Nick Bontis used data given by 233 active researchers to determine how they ranked academic journals. They hypothesized that the exposure would be at play if these participants assigned greater ranking to journals simply because they are more familiar with them rather than basing their ranking on an objective assessment of the journal’s contribution to the field.

Their analysis confirmed the role of the mere exposure effect. More specifically, they found that researchers who had previously published or worked for a particular journal rated it higher than those who had not, and that perceptions of a journal were strongly correlated with researchers’ degree of familiarity with it.

What it is

The mere exposure effect is our tendency to develop preferences for things simply because we are familiar with them

Why it happens

There are two main reasons why we experience the mere exposure effect. First, we are less uncertain about something when we are familiar with it. We have evolved to be careful around new things because they could pose a danger to us. This uncertainty is reduced as we see something repeatedly without noticing bad consequences. Second, in what’s known as “perceptual fluency,” we are better able to understand and interpret things we have already seen before. Our mind generally looks for the path of least resistance, and so we prefer stimuli that we have already been exposed to

Example #1 – Finance and domestic investment

Professions in finance may be particularly impacted by the mere exposure effect. A 2015 found that financial traders were more likely to invest in domestic companies they were familiar with, even though this is not the most profitable or risk-averse strategy. This “home country bias” was attributed to investors’ familiarity with the firms.

Example #2 – Journal ranking in academia

The mere exposure effect is present in academia. A study done in 2010 used data given by 233 active researchers to determine how they ranked academic journals. It concluded that researchers assigned journals higher ranking on the basis of their familiarity with them rather than an objective assessment of the journal’s contribution to the field.

How to avoid it

The mere exposure effect may eventually counteract itself. Research has shown that too much exposure may limit and then detract from our attraction to a stimulus. We can actually start to avoid something if we are exposed too much to it. A 1990 study identifies this as “boredom” with the stimulus. A more proactive strategy might be to recognize the value of diversity and new experience. By looking for unfamiliar and different experiences, we might limit how often we are exposed to any one stimulus.