Across the participant cohort, overall EMG reactivity was significantly correlated with emotion identification accuracy (rho = 0.331, p = 0.011) and mean trial EMG reactivity was significantly higher for trials on which the emotion was correctly identified (n = 1586) than on error trials (n = 1314; p = 0.002). This differential effect of correct versus incorrect trials showed a significant interaction with participant group (F(4) = 4.18, p = 0.002; see Fig. 2). Among healthy controls, there was a strong trend towards greater reactivity predicting correct identification (p = 0.087). Comparing trial types within patient groups, EMG reactivity was significantly higher on correct identification trials than error trials in the bvFTD group (p = 0.009) and the nfvPPA group (p = 0.01) but not the rtvFTD group (p = 0.76) or the svPPA group (p = 0.06, here signifying a trend towards greater EMG reactivity on incorrect trials).