How Your Generosity or Selfishness Colors How You See Others
A recent study reminds us that the loudest voice in the room is often our own. When we judge the people around us, we are not merely taking a survey of social norms or watching the crowd for cues. Instead, the research shows our own nature — whether we lean toward generosity or selfishness — calls the shots. The findings, reported by Neuroscience News and drawn from work by Bogdan and colleagues at the University of Illinois, challenge the long-held assumption that societal expectations are the primary influence on how we perceive others in competitive situations.
Your Own Rulebook, Not the Crowd's
The study, published in Cognitive Science, set out to test two competing ideas. One view holds that people form expectations about others by observing what is typical in their social environment. If everyone around you is selfish, the thinking goes, you will learn to accept selfishness and adjust your own behavior accordingly. The alternative — and the one the researchers wanted to weigh, is that people evaluate others by reflecting on their own decisions, measuring other people's actions against their internal rulebook.
To compare these views, the team ran four studies. The first used an Ultimatum Game, a classic setup where one player (the proposer) splits a $10 pot and another player (the responder) can accept or reject the offer. If the responder rejects, neither player gets paid. This design let the researchers swap roles within the same session, watching how a person's behavior as a proposer shaped their expectations as a responder.
The results were striking. Generous proposers tended to accept only generous offers in the responder role. Selfish proposers, meanwhile, were content with selfish offers, even when those offers left them financially worse off. In other words, a person's own behavior was the lens through which they judged fairness. The crowd's typical behavior mattered far less.
The Cost of Being True to Yourself
The implications go well beyond a single game. In follow-up experiments, the researchers found that generous people reward generosity and selfish people punish it, often at a personal cost. If a selfish player receives a generous offer, they may still punish the proposer, preferring to maintain the consistency of their own worldview rather than walk away with extra money. This willingness to sacrifice personal gain for the sake of behavioral consistency suggests that our internal compass outweighs external incentives.
Further studies expanded the scope. Study 2 replicated the Ultimatum Game findings and showed that observing selfish behavior only shifts onlookers' acceptance of selfishness if those onlookers have already turned selfish themselves. Study 3 generalized the results to a Public Goods Game, demonstrated cross-cultural persistence, and even uncovered antisocial punishment, whereby selfish players punish generosity and generous players punish selfishness, regardless of what is normatively common in their culture.
Perhaps most telling, the cross-cultural data revealed that societal norms do influence people, as other studies have confirmed. But the Illinois team's key point is that we are not only observers. As Florin Dolcos put it, "We filter information about the world through our own view." Cultural tendencies toward self-interest or generosity nudge us, but they do not override the primary driver: our own behavior.
Trusting the Mirror Image
The final study, using a Trust Game, added another layer. Participants were asked to trust another player who either reciprocated their behavior or did the opposite. The results were clear: participants trusted players who behaved as they themselves did, even if that behavior was selfish, as much as they trusted generous players. Paul Bogdan summed up the feeling succinctly: "People really like others who are similar to themselves, to a shocking degree."
This trust effect helps explain a broader social phenomenon called social alignment. When people's behavior shifts over time, say, from generous to selfish, they become more likely to punish the opposite behavior and reward the one they now embody. Groups can settle into patterns where selfish individuals are more accepting of other selfish individuals, and newcomers may feel pressured to display the same behavior in order to be part of the group. The reverse is true for generous circles, too.
Beyond the Lab
The researchers were careful to note that this is not just about decision-making in games. Sanda Dolcos emphasized that the findings have practical relevance to many types of social interactions and social evaluations. Understanding that our own nature is the primary filter for social perception could change how we approach cooperation, conflict resolution, and even organizational culture.
For anyone who has ever wondered why they click, or clash, with certain people, the answer may be quieter than we like to admit. We are not blank slates soaking up the expectations of those around us. We are, each of us, walking mirrors, reflecting our own tendencies back onto the people we meet. The study's most honest takeaway is that if you want to change how you see the world, the most effective place to start may be looking in the mirror.
Source: Neuroscience News article on study by Bogdan et al. (Cognitive Science), https://neurosciencenews.com/selfish-generous-behavior-perception-23760/
For related research on reciprocal generosity dynamics, see the article "Hierarchical shifts and the erosion of reciprocal generosity".
