When Ayaka was asked to help a coworker at a Tokyo restaurant, she didn’t just think about what others said about that person. She remembered how they treated her last week. If they’d helped her, she judged their refusal harshly—even if everyone else thought they were difficult. If they’d ignored her before, she didn’t mind when they said no. Ayaka isn’t real, but her choices reflect what hundreds of real people revealed in a new study from Rissho University.
We often trust what others say about someone when deciding whether to help them. This idea—called indirect reciprocity—is a cornerstone of cooperation in society. But what happens when someone’s reputation clashes with your own experience? That’s what Professor Hitoshi Yamamoto and his team set out to test. In two experiments involving 480 participants in Japan, people read scenarios about coworkers and neighbors who either helped or refused requests. The researchers changed two things: the target person’s public reputation (good or bad), and whether that person had previously helped or refused the participant.
The results were clear: when judging someone’s refusal to help, personal experience overpowered reputation. Even if a person had a bad public image, participants viewed their refusal more negatively if that person had helped them personally before. On the flip side, if the person had once turned the participant down, their refusal was seen more favorably—even if they were widely respected. Cooperation, however, was judged differently. Helping others was seen positively no matter the reputation or past behavior.
One surprising finding stood out: even when refusing someone with a bad reputation who had previously been uncooperative, participants didn’t see the refusal as good—just neutral. This suggests we don’t reward refusal easily, even when it seems justified. As Yamamoto explains, “In everyday life, we judge others by combining many different kinds of information, including what we hear about them from others and what we have experienced ourselves.”
This study, published September 14, 2026, in Evolution and Human Behavior, adds depth to how we understand social trust. In a world where online ratings and AI-driven judgments shape decisions—from hiring to lending—this research reminds us that nothing replaces firsthand experience. As digital interactions grow, the question remains: can algorithms ever capture the weight of a personal encounter?