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Interoception and Facial Emotion Perception1555Cardiac Interoceptive Accuracy and Self-Report Measures of Interoception, Autistic Traits, and Emotion Recognition AccuracyUsing Mahalanobis distance, we identified and removed bivariate outliers in the relation between Cardiac interoceptive accuracy and Trait interoceptive accuracy(n = 7), Trait interoceptive attention (n = 6) and Autistic traits (n = 6), as well as in the relation between the Interoceptive trait prediction error and Autistic traits (n = 5). In line with the theoretical separation between interoceptive accuracy and attention (Gabriele et al., 2022), we did not find a significant relation between Cardiac interoceptive accuracy and Trait interoceptive attention in our study (p > .05). Contrasting our expectations, Cardiac interoceptive accuracy was neither positively related to Trait interoceptive accuracy nor negatively related to Autistic traits(both with and without controlling for Alexithymia). There was a trend towards a higher interoceptive trait prediction error with higher Autistic traits (r = .20, p = .05), which did not survive the correction for the four comparisons (padjusted = .20). The associated correlation matrix can be found in Table S21 in the Supplemental Materials, and a visualization of the relations between all investigated variables Figure S1B in the Supplemental Materials. Lastly, Cardiac interoceptive accuracy was not a significant predictor in the GLMM on Emotion recognition accuracy (p > .05 for both the main effect and the interaction; see also Table S22 in the Supplemental Materials). As Cardiac interoceptive accuracy was not related to any of our variables of interest, we did not further investigate its role in Emotion recognition accuracy(related to facial mimicry).Facial Mimicry in Emotion Recognition and its Modulation by Autistic Traits The model examining whether the link between facial muscle responses and recognition accuracy of distinct facial expressions would be modulated by Autistic traits did not reveal any effects beyond those already reported for the first model of the results section (see also Table S23 in the Supplemental Materials). Thus, facial muscle responses were not predictive of Emotion recognition accuracy, and there was also no effect of Autistic traits on this link.Exploratory AnalysisNeither interoception measures nor facial muscle activations could explain altered emotion recognition associated with autistic traits in this study, or were themselves significant predictors of recognition accuracy. In line with previous work, trait interoceptive accuracy was significantly linked to the perceived emotional