To ensure that the attenuated UE-E RT difference in the ASD participants was robust to correction accuracy, we calculated inverse efficiency scores (IES) as RT/(1-accuracy) for each condition. As for the analysis of RT and error rates alone, see main manuscript, there was a significant main effect of expectedness (F(1.8,83.11)=34.24, P<0.001) and noise (F(2,94)=6.87, P=0.002) and again only the expectedness*group interaction was significant in this analysis (F(2,94)=9.98, P<0.001). The noise*group (F(2,94)=0.24, P=0.79) and expectedness*noise*group interactions were not significant (F(4,188)=2.2, P=0.07). Thus, our primary reaction time finding is robust to correction condition-specific accuracy (ASD, n=24; NT, n=25). ASD, autism spectrum disorder. NT, neurotypical. RT, reaction time. Data points represent individual participants, shaded regions and error bars show 95% confidence intervals and 1 standard deviation of the mean for each condition and group. E=expected, N=neutral and UE=unexpected.