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Facial Mimicry and Metacognition in Facial Emotion Recognition1134Autistic traits. Similar to the models including social anxiety traits, there was no significant interaction between autistic traits and corrugator activity in accurately recognizing fearful or angry facial expressions (see Tables S15 and S17 in the Supplemental Material for the model fits). Contrasting the other negative expressions, the model on the recognition of sad expressions showed a significant interaction between corrugator activity and autistic traits as well as a significant main effect of corrugator activity. More specifically, in line with the social anxiety model, sad facial expressions were better recognized with higher corrugator activity, %u03c72(1) = 4.556, p = 0.033, OR = 1.597. This relationship was, however, weaker for higher autistic traits, interaction: %u03c72 (1) = 4.142, p = 0.042, OR = 0.668 (see Fig. 5B and Table S18). Furthermore, significant effects of zygomaticus activity and of corrugator activity as well as a significant interaction between zygomaticus activity and autistic traits were found in the model on happy expressions, zygomaticus: %u03c72(1) = 5.300, p = 0.021, OR = 14.184, corrugator: %u03c72(1) = 4.679, p = 0.031, OR = 0.069, autistic traits*zygomaticus: %u03c72(1) = 5.503, p = 0.019, OR = 0.137. Thus, in addition to the activation of the zygomaticus, which was already described previously, a relaxation of the corrugator might facilitate the recognition of happy expressions. Similar to the model including social anxiety traits, autistic traits had a negative effect on the positive association between zygomaticus activity and accuracy in the recognition of happy expressions (see Fig. 5C and Table S16 in the Supplemental Material). This interaction again seemed to be driven by cases of low zygomaticus activity associated with inaccurate responses, but this time linked to low autistic trait levels.