Fig. 2.

Reaction times (RTs) and electromyographic (EMG) activity for each group: healthy control subjects (HC), unaffected siblings (SIB), and patients with schizophrenia (PSZ). (A) Estimated marginal means (ANCOVA) of RT for button release at movement start (RT-Release) and EMG-Onset for each GO probability (33%, 50%, and 66%) and group. (B) Estimated marginal means (ANCOVA) of RT for button press at movement end (RT-Press) and EMG-Offset for each GO probability and group. Significant differences between probabilities across groups are indicated with horizontal lines below the graph. (C) Estimated marginal means (ANOVA) of duration of EMG activity for each Go probability over groups. Circles indicate the mean for each group. Vertical bars correspond to 95% confidence interval (CI).