The grand means of the SEP for the different recording sites.

<p>Electrodes were implanted epidurally above the vertex (Vx), primary somatosensory cortex (S1) and the anterior cingulate cortex (Acc). The average of the SEP signals obtained during session 2 and 3 for the paired (n = 12) and random group (n = 12). The curve interruption denotes the stimulus onset.