EEG field mapping

A method for plotting isopotential maps of EEG fields is described. Forty-eight EEG channels are recorded, computer-processed, and used to plot a chart of the potential distribution every msec. This technique shows the usual characteristics of the EEG, and also some parameters that are normally hidden, such as the shape, surface and slope of the waves. The components of the visual evoked potential, for example, appear to be 'saltatory', as they do not move from one place of the scalp to another.