Figure 2: A. Averaged responses, showing identified waves, recorded from C3, with respect to the mastoid. Two series of 20 stimuli were delivered to the right median nerve, with irregular stimulus intervals of more than 1 s. B. Responses evoked at vertex (C2) with respect to mastoid, following similar stimulus sequences, and displayed on a slower sweep. In A and B the times of stimulation are shown by arrows. C. Four superimposed traces of a cell in the ventral posterolateral (VPL) nucleus of the human thalamus, responding to contralateral wrist stimulation. The shortest latency is 13 ms. From McComas with permission.45 D. Field potentials recorded in human VPL following wrist stimulation.

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