1. The method of detecting and characterizing brain pathology in a patient, comprising the steps of: determining the patient's evoked potential data; preparing a brain electrical activity map representing said evoked potential data; determining the location of one or more peaks of said evoked potential data in each of a sequence of frames; calculating the center of gravity of said peaks for each frame; plotting said center of gravities in a single frame to provide a spatial trajectory of said evoked potential data; and detecting and characterizing brain pathology in the patient by comparing the appearance of said spatial trajectory to a comparable trajectory for normal patients.