Fig. 2. Control state. (A and B ) Response times (A ) and corresponding proportion of correct responses (B ) reported by subjects in the “control state” before regional anesthesia. White squares correspond to responses given to stimuli depicting right hands (i.e. , dominant hands); black squares , left hands (i.e. , nondominant hands). The averages for the six natural and six unnatural orientations are presented for each view. Error bars represent SD. The ANOVA main effect of orientation (natural/unnatural) was significantly different for both proportion of correct responses (F1,19= 20.9, P < 0.0001) and response times (F1,19= 103.1, P < 0.0001).