<p>The mean amplitudes of ERPs at different electrodes are presented for AWS (red solid line) and AFS (black solid line) under the Go condition and for AWS (red dashed line) and AFS (black dashed line) under the NoGo condition. The mean RTs (speech onset time) are indicated in vertical dashed lines. An example of S2-N2 is shown at Fz, and an example of S2-P3 is shown at Pz.</p