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Embodied Facial Emotion Processing in Autism and Social Anxiety1736interpretation and regulation of internal signals (Chen et al., 2021), has revealed that physiological signals are objectively sensed less accurately by individuals on the autism spectrum compared to neurotypical individuals (Failla et al., 2020; Garfinkel et al., 2016). While distinct body sensations are subjectively overperceived (Garfinkel et al., 2016), individuals on the autism spectrum report difficulties in the integration of different sensations and their interpretation (Fiene et al., 2018; T. R. Hatfield et al., 2019). Reduced interoceptive accuracy in autism has already been linked to reduced empathy in past research (Mul et al., 2018), yet not consistently (Butera et al., 2023), which highlights the importance of exploring this potential influence on perceiving others%u2019 emotions more strongly. Although objectively not differing from individuals without social anxiety in their physiological responses, individuals with social anxiety have reported to perceive their own bodily arousal more strongly in social settings (Edelmann & Baker, 2002; Nikoli%u0107 et al., 2015; Shalom et al., 2015), suggesting a higher interoceptive attention. Studies which objectively assessed the sensation of one%u2019s heartbeat (i.e., cardiac interoception) have yet described a reduced accuracy in individuals with social anxiety compared to control participants (Gaebler et al., 2013) or found no group differences (Antony et al., 1995). In how far alterations in perceiving one%u2019s own physiological signals relate to altered perception of other%u2019s emotions in social anxiety is still to be determined. Objectives of the Current StudyThe goal of the current study was to investigate putative alterations in the role that physiological feedback might have in facial emotion processing in autism and social anxiety. Hence, we first measured automatic changes in facial muscle activity (i.e., facial mimicry) and in skin conductance while participants were passively viewing spontaneous and standardized videos of facial emotional expressions. In a separate task, participants were asked to label each viewed expression according to five categories, to indicate their confidence in correctly labelling the expression, and to judge its emotional intensity. These measures allowed us to test whether sensorimotor simulations of some facial expressions and/or changes in arousal would be differentially predictive of (a) correctly recognizing an expression; (b) confidence in one%u2019s performance; and (c) judging the intensity of another person%u2019s emotional experience in individuals on the autism spectrum or with social anxiety compared to matched control participants. Based on the