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Facial Mimicry and Metacognition in Facial Emotion Recognition1074the respective category against the neutral reference category. Since the residual plots of the two model fits on zygomaticus activity showed violation of the normality assumption as well as heterogeneous error estimates, we calculated non-parametric estimates of the predictor effects and confidence intervals, using 1000 bootstrap iterations, for these two models. As neither main effects of clinical traits nor interaction effects with emotion category were found, the results, including significant effects of emotion category on EMG activity, are reported in the Supplemental Materials (Tables S7 %u2013 S10).Link between facial muscle activity (mimicry) and emotion recognition accuracy. As outlined in the introduction (see Mimicry and Emotion Recognition section), the association between facial muscle activity and emotions, including mimicry of expressions, is specific for each emotion category. Emotion recognition should only be informed by facial muscle activity that is in line with the assumed mimicry responses for the specific emotion (e.g., increase in zygomaticus activity and decrease in corrugator activity for happy expressions, and increase in corrugator for sad expressions). Therefore, we ran separate analyses for the emotion categories anger, happiness, sadness, and fear to investigate the relationship between intraindividual differences in facial muscle activity and emotion recognition accuracy in the context of varying clinical trait levels. Binomial GLMMs were fitted on emotion recognition accuracy with the trial-averaged EMG activity over the two muscle regions (corrugator and zygomaticus) as distinct predictors, as well as one of the clinical trait scores and both two-way interactions (8 models in total). Similar to the behavioural accuracy models, random intercepts were added for the subject as well as the stimulus identity. This resulted in the following models:1. LSAS * CORRUGATOR %uf0e0 ANGER RECOGNITION ACCURACY2. LSAS * CORRUGATOR + LSAS * ZYGOMATICUS %uf0e0 HAPPINESS RECOGNITION ACCURACY3. LSAS * CORRUGATOR %uf0e0 SADNESS RECOGNITION ACCURACY4. LSAS * CORRUGATOR %uf0e0 FEAR RECOGNITION ACCURACY5. AQ * CORRUGATOR %uf0e0 ANGER RECOGNITION ACCURACY6. AQ * CORRUGATOR + AQ * ZYGOMATICUS %uf0e0 HAPPINESS RECOGNITION ACCURACY7. AQ * CORRUGATOR %uf0e0 SADNESS RECOGNITION ACCURACY8. AQ * CORRUGATOR %uf0e0 FEAR RECOGNITION ACCURACY