[Comparison of electrically evoked response (EER) and visual evoked potential (VEP) by topography and dipole-tracing]

To study the possibility of the clinical application of the electrically evoked response (EER) of the visual system, we analyzed P2 of EER as well as P100 of flash VEP by means of topography and dipole-tracing. By applying a constant electric current of 1.0 mA (duration 5 msec, frequency 1.39 Hz) and a strobo flash light of 0.6 Joules (frequency 1.39 Hz) to each eye, P2 and P100 were recorded respectively. It was found that the source generators of P2 and P100 showed the same localization and dipole vector. The results indicated flat the significance of P2 in applying EER clinically was comparable to the P100 of VEP.