“…However, in man, a number of problems still remain unsettled, although many equipments to detect the evoked potentials are designed and the configuration of evoked potentials is analysed by many investigators. Concerning photically evoked potentials (PEPs), Cobb and Dawson,1) Monnier,2,3) Ciganek4) and others [5][6][7][8][9][10] reported the configuration in detail , but their results are not in agreement.…”