Mimicry boosts social bias: unrealistic optimism in a health prevention case

Unrealistic optimism bias appears when a person perceives oneself–in comparison to peers–as less at risk from threats. This bias has been widely reported and the consequences are clear: it puts one's health in danger. The existing body of literature proposes egocentrism as a mechanism leading to a reduction in this bias. The present paper tests a novel mechanism orienting a person toward others–thus linked with egocentrism–i.e., mimicry. Results showed directly opposing effects: mimicry induced a stronger tendency to perceive oneself as less threatened. This result is not only surprising but especially alarming since mimicry may be used in patient-doctor dialogue which may backfire, leading to resistance to medical recommendations provided by the doctor. © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.