The upper row represents ĀC(t) obtained by averaging each an(t) over all control subjects. ĀC(t) were used to identify the peaks of activation of the 4 an(t). 2 peaks for ā1C(t) (Pa1 and Pa2), 2 peaks for ā2C(t) (Pa3 and Pa4), 1 peak for ā3C(t) (Pa5), and 2 peaks for ā4C(t) (Pa6 and Pa7) were detected. Lower rows represent, for each group separately (Dystonia: light gray; Control: dark gray), the frequency distribution of the time of occurrence of each peak (Tpan). No statistical between-group differences were reported for any of the peaks.