Patent ID: 7972278

Claim:
A method for analysing at least one multifocal visual evoked potential response of at least two subjects, the at least one visual evoked potential response being induced by multifocal stimulation, wherein the stimulation is adapted to simultaneously stimulate different parts of the visual field of an eye of the subject such that different parts of the visual field are stimulated with random sequences of different timing or character, the method comprising: (a) for each subject, with electrodes placed on the scalp or in contact with the eye of each subject, simultaneously recording (A) the at least one visual evoked potential responses from each of the different parts of the visual field of the eye and (B) the subject's overall spontaneous brain activity levels; (b) for each subject, identifying, with a computer, the alpha rhythm component in the subject's overall spontaneous brain activity levels; (c) for each subject, removing, with said computer, the alpha rhythm component from the subject's overall spontaneous brain activity levels; (d) for each subject, calculating, with said computer, a corresponding scaling factor, the scaling factor being derived from the subject's overall spontaneous brain activity levels from which the component of alpha rhythm is identified and removed; (e) for each subject, scaling, with said computer, each subject's visual evoked potential response with said each subject's scaling factor such that the variability of the visual evoked potential responses induced by the multifocal stimulation between the at least two subjects is minimized; and (f) for the at least two subjects, storing or displaying said scaled visual evoked potential response.