Grand-averaged waveforms and topographies of auditory- and somatosensory-evoked potentials. Superimposed waveforms recorded from 27 channels, obtained in the 2, 0.5 and 0.1 Hz conditions, and by the subtraction of the 2 Hz-waveform from the 0.5 Hz-waveform (Subtraction 1) and the subtraction of the 0.5 Hz-waveform from the 0.1 Hz-waveform (Subtraction 2). Isocontour maps at several peaks of the root mean square (indicated by arrows) are shown on the right.
Tanaka et al. BMC Neuroscience 2008 9:116 doi:10.1186/1471-2202-9-116