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Interoception and Facial Emotion Perception1355Figure 1. Experimental design of the online study (Experiment 1) and the lab study (Experiment 2. prep = preparation, fEMG = facial electromyography, ER = emotion recognition, ECG = electrocardiography, AQ = Autism Quotient, IAS = Interoceptive Accuracy Scale, BPQ = Body Perception Questionnaire, LSAS = Liebowitz Social Anxiety Scale, TAS-20 = Toronto Alexithymia Scale (20-item version), BAS = Body Appreciation Scale (not examined), IATS = Interoceptive Attention Scale.Experiment 1MethodParticipantsWe tested 100 adult participants between 18-35 years-old who reported no prior or current psychiatric or neurological disorder. The choice of the sample size was based on a power analysis with simulated data, indicating a power of .94 (or 1) to find significant relations between autistic traits (or social anxiety traits) and emotion recognition accuracy with a similar effect size as in a previous study (Folz et al., 2023). More details on the sample size rationale can be found in the preregistration of the study (https://osf.io/wugq7). Out of the 100 participants, 70 participants were recruited via the online recruitment platform SONA of Leiden university (student population) and 30 participants were recruited via a direct link between 28/12/2020 and 24/01/2021. One participant did not meet the age criterion (18-35 years-old) and was excluded after data collection. Our final sample consisted of 99 participants (86 females, 12 males, 1 %u2018prefer not to say%u2019) with an age range between 18 and 34 years (M = 21.39, SD = 4.27). The majority of our participants were Dutch (45 individuals), Macedonian (23 individuals) or German (10 individuals), and all participants completed the experiment in English. There