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Chapter 5154confidence in the recognition of happy expressions with higher Autistic traits(see Figure 5C). Moreover, for neutral expressions, we found robust evidence for a positive estimated slope at average Autistic traits (see Table 5). Thus, especially at average and %u201chigh%u201d autistic trait levels, confidence in the recognition of neutral expressions seems to increase with higher trait levels, matching the findings regarding a better recognition of neutral expressions with higher trait levels. We also observed a significant positive slope at all three examined points of the Trait interoceptive accuracy distribution (mean %u2013 1SD, mean, mean + 1SD) across emotions. When splitting by emotional expression categories, the robust positive slope only remained significant for neutral expressions at %u201clow%u201d(mean %u2013 1SD) and average Trait interoceptive accuracy (see Table 5). Thus, the effect of higher confidence in emotion recognition with higher trait interoceptive accuracy seems most pronounced in the evaluation of neutral expressions (see Figure 4F). For all other predictors, slopes were not significantly different from 0 across and within emotion categories. Table 5. Integrated posterior estimates of the Generalized Linear Mixed Model with a zero-one-inflated family for the slopes of the relation between confidence in emotion recognition and self-report measures at three different values (mean -1SD, mean, mean +1SD) Self-report measureMean %u2013 1SDEstimated slope [95% HPD]MeanEstimated slope [95% HPD]Mean + 1SDEstimated slope [95% HPD]Autistic traits(AQ) 0.00 [-0.02, 0.02] 0.00 [-0.02, 0.02] 0.00 [-0.02, 0.02]Emotion categoryAngry -0.01 [-0.03, 0.02] -0.01 [-0.03, 0.02] -0.01 [-0.03, 0.02]Fearful 0.01 [-0.01, 0.03] 0.01 [-0.01, 0.04] 0.01 [-0.01, 0.04]Happy -0.01 [-0.02, -0.00] -0.02 [-0.03, -0.00] -0.02 [-0.05, -0.00]Sad -0.01 [-0.04, 0.01] -0.01 [-0.04, 0.01] -0.01 [-0.04, 0.02]Neutral 0.03 [-0.00, 0.06] 0.03 [0.00, 0.06] 0.03 [0.00, 0.06]Interoceptive accuracy(IAS)0.02 [0.00, 0.04] 0.02 [0.00, 0.04] 0.02 [0.00, 0.04] Emotion categoryAngry 0.02 [-0.00, 0.04] 0.02 [-0.00, 0.05] 0.02 [-0.00, 0.05]Fearful 0.02 [-0.02, 0.04] 0.02 [-0.02, 0.05] 0.02 [-0.02, 0.05]Happy 0.00 [-0.01, 0.03] 0.00 [-0.01, 0.02] 0.00 [-0.01, 0.01]Sad 0.02 [-0.00, 0.04] 0.03 [-0.00, 0.05] 0.03 [-0.00, 0.06]Neutral 0.03 [0.00, 0.06] 0.03 [0.00, 0.06] 0.03 [-0.00, 0.06]Note. HPD = Highest Posterior Density interval