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Facial Mimicry and Metacognition in Facial Emotion Recognition1054general hypotheses testing, the sjPlot package (L%u00fcdecke, 2021) for creating the tables and both the sjPlot package and ggplot2 (Wickham, 2016) for creating the plots. Behavioural AnalysisAccuracy and confidence. In order to test whether social anxiety traits were associated with better emotion recognition performance for negative expressions and whether emotion recognition accuracy was generally reduced with higher autistic traits, we calculated two binomial GLMMs on accuracy with emotion category (anger, fear, happiness, sadness, surprise, and neutral), the respective trait dimension (autistic traits or social anxiety traits), and their interaction as fixed effects. Both participant ID and the identity of the stimulus were added as random effects (random intercept). Furthermore, we fitted two LMMs on emotion recognition confidence to test the association between confidence level and i) social anxiety traits, ii) autistic traits . The models had the same fixed and random effects structure as the accuracy models. Coefficients for the emotion categories (main effects and interactions) were calculated by contrasting each single category against the mean of all categories (sum coding) to determine significant deviations from mean accuracy (main effect) or the mean effect of a trait dimension (interaction). For the neutral category, coefficients were calculated and tested (z-tests) using general hypotheses testing. Lastly, we explored whether the relation between confidence and emotion recognition was altered depending on an individual%u2019s clinical trait levels as well as the presented expression. To do so, we added emotion recognition confidence and all 2-way interactions as well as the 3-way interactions with emotion category and the respective clinical trait dimension to the accuracy models. The resulting model fits were the following:1. LSAS * EMOTION CATEGORY %uf0e0 EMOTION RECOGNITION ACCURACY2. AQ * EMOTION CATEGORY %uf0e0 EMOTION RECOGNITION ACCURACY3. LSAS * EMOTION CATEGORY %uf0e0 EMOTION RECOGNTION CONFIDENCE4. AQ * EMOTION CATEGORY %uf0e0 EMOTION RECOGNTION CONFIDENCE 5. LSAS * EMOTION CATEGORY * CONFIDENCE %uf0e0 EMOTION RECOGNITION ACCURACY (exploratory)6. AQ * EMOTION CATEGORY * CONFIDENCE %uf0e0 EMOTION RECOGNITION ACCURACY (exploratory)