New neuroscience research is adding detail to a familiar problem: people often struggle to spot dishonesty, particularly when the message sounds beneficial. The findings suggest that the promise of a gain can subtly weaken how carefully we evaluate whether information is true.
The study, led by Yingjie Liu of North China University of Science and Technology, tested how people judge messages depending on who delivers them. Researchers focused on whether trust shifts when information comes from a friend versus a less familiar person.
Inside the brain during deception
Using brain imaging with 66 healthy adults, the team examined neural activity while participants exchanged information through computer screens. Messages were framed around outcomes described as gains or losses, allowing scientists to track how reward and risk contexts shape belief.
Across the experiment, participants were more likely to accept false information in gain situations. Brain regions linked to reward processing, risk assessment and interpreting others’ intentions showed patterns consistent with relaxed scrutiny when a positive outcome seemed possible.
Why friends can be persuasive
Friendship added another layer: when a friend delivered the potentially misleading message, the pair showed synchronized brain activity. That alignment shifted with context, strengthening in reward-related areas during gains and in risk-related areas during losses.
Researchers reported that these shared neural patterns helped predict when someone was most likely to be misled by a friend. The results point to a mechanism in which social closeness and reward expectations combine to make certain claims feel credible even when they should prompt doubt.
While the work does not mean people always trust friends blindly, it highlights a consistent vulnerability. In everyday decisions, offers that appear mutually beneficial may deserve extra verification, precisely because the brain can treat them as safer than they are.
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