Figure 1.
Diagrammatic representation depicting summation of ipsilaterally and contralaterally generated MEPs from cortical stimulation, as a result of transcallosal or deep white matter conduction of stimulating current in the cross scalp stimulating position (top row). This has resulted in MEPs of larger amplitudes than those obtained with the midline stimulating position (bottom row). Arrows indicate the site of active cortical stimulating electrode.