Figure 3

Grand averaged ERP waveforms over all subjects at electrodes C1, Cz, and C2 for motor-only with random delay task (MO_R, dashed line), original motor-vocal task with random delay (MVR, thin solid line), and corrected motor-vocal task with random delay (MVR_A, thick solid line). The response for the MVR_A condition was calculated by a subtraction of the response for the MO_R condition from that for the MVR condition.