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The project comprises several studies conducted with a video set of 52 participants (‘targets’) with and without Borderline Personality Disorder (BPD), who briefly speak about their personal preferences such as their hobbies. In study 1, we showed these videos to two rater samples to assess whether raters would evaluate targets with BPD more negatively than healthy control targets. Specifically, raters evaluated targets on the dimensions trustworthiness, likeability, and estimated behaviour in a dictator game (i.e. cooperativeness). Results showed that BPD targets were evaluated as less likeable and trustworthy, and in one rater sample also as less cooperative. In study 2, a third rater sample rated visual cues (positive and negative facial affect display, degree of eye contact) to serve as mediators for the association between target group (BPD vs. HC) and trustworthiness, likeability, and cooperativeness ratings. Results showed that low positive and high negative affect display likely contributed to the negative evaluations of those with BPD observed in study 1. In study 3, we showed the target videos to three groups of raters. A group with BPD, a clinical control group of individuals with social anxiety disorder (SAD), and a healthy control group. In this dataset we replicated the results from study 1, assessed BPD individuals as raters of first impressions, and investigated rater×target interaction effects. Moreover, we included the novel process-tracing tool mouse-tracking in study 3, to assess the process underlying impression formation.