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Interoception and Facial Emotion Perception1375recognition task, all participants provided demographical information regarding their age, gender, and nationality first. The order of the following questionnaires (see Measurements section and Figure 1) was randomized across participants. At the end of the experiment, participants could decide to enter the lottery for the 10%u20ac vouchers/donation by providing their email address.MeasurementsAutistic traits. We used the Autism-Spectrum Quotient (AQ; Baron-Cohen et al., 2001) as a self-report measure of traits associated with the autism spectrum. Respondents rate how strongly each of 50 items applies to them on a 4-point Likert scale (1 = definitely agree, 2 = slightly agree, 3 = slightly disagree, and 4 = definitely disagree). Some items are reverse-coded, and all items scores are binarized (1 or 2 to 0 and 3 or 4 to 1) before summation. Sum scores can be calculated for five separate subscales with ten items each (social skill, attention switching, attention to detail, communication, and imagination) as well as for one total autistic trait score. Higher sum scores reflect higher autistic trait levels. In our experiments, 2 participants had a higher AQ score than 32 which has been described as cutoff for clinical significance. More detailed descriptive information about all questionnaires scores, including an overview of the reliabilities and distribution parameter, can be found in Table 1. A visualization of the relations between the questionnaire measures can be found in Figure S1A in the Supplemental Materials.Trait interoceptive accuracy. The Interoceptive Accuracy Scale (IAS; Murphy et al., 2020) was used to assess self-reported interoceptive accuracy with regard to various body sensations (e.g., heartbeat, hunger, need to urinate,..). Interoceptive accuracy for each of the 21 IAS-items are evaluated on a 5-point Likert scale (1 = disagree strongly, 2 = disagree, 3 = neither agree nor disagree, 4 = agree, and 5 = strongly agree), and higher sum scores represent a higher self-reported interoceptive accuracy (see Table 1). Interoceptive sensibility. We used the body awareness scale of the short form of the Body Perception Questionnaire (BPQ-SF; Porges, 1993) to assess interoceptive sensibility in our sample. Statements regarding the awareness of 26 body sensations (e.g., sweaty palms, stomach and gut pains,..) are rated on a 5-point Likert scale (1 = never, 2 = occasionally, 3 = sometimes, 4 = usually, and 5 = always). Sum scores are regarded as an integrated measure of interoceptive sensibility, with higher scores indicating higher interoceptive sensibility (see Table 1).