1. A method of analyzing EEG data in order to differentiate between ongoing neuro-electric activity of the brain of a subject and evoked neuro-electric activity of the brain of said subject, said analysis being based upon the time, polarity and amplitude distributions of deflections from the base line of said EEG and EP data, said method comprising a. recording by EEG measurement said ongoing neuro-electric activity; b. administering a series of sensory stimuli to said subject; c. recording by EEG and EP measurement neuro-electric activity evoked in response to said stimuli; d. marking the time of occurrence, polarity and amplitude of each of said deflections recorded; e. generating a histogram of time periods of said deflections for a defined duration prior to, during and subsequent to each of said single stimuli, said histogram reflecting the deflections within said time periods, generating a deflection time distribution based upon data from said histogram, generating an amplitude profile of said deflections; and f. using said deflection time distribution and said amplitude profile to statistically analyze and evaluate the ongoing and evoked neuro-electric activity, such that the differentiation between said ongoing neuro-electric activity and said evoked neuro-electric activity may be quantified.