Emotional reactions can serve to guide perceptions of group and others. Expressions of negative affect are utilised by third-party observers to classify an action as inappropriate and to infer what makes it inappropriate. We aim to extend these findings by focusing on two positive emotional reactions (gratitude and admiration) in response to ambiguous norm-related behaviours. Considering the antecedents of those emotions in a normative context, we expect the two expressions to impose diverging group values, and different outcomes on perceptions of warmth and competence characteristics. In a within-subjects design participants will be exposed to short written vignettes depicting Person A engaging in an ambiguous behaviour and group member B observing and/or reacting with gratitude, admiration or neutral reaction. Following, subjects will rate the values of the group the actors belong to, and Person A’s warmth and competence. We will test our predictions in a mixed-effect model with emotion as our predictor variable and third-party perceptions as our outcome variables.