Central visual field contributions to the visual-evoked response

Visual evoked responses (VER) were recorded from bipolar electrodes placed transversely across the occipital region. A series of apertures were used to block the stimulation of the foveal area. The transverse distribution of the C2 component of the VER corresponds to a radial dipole source, and this is consistent with a foveal origin in the visual cortex. A clinical test for the presence of intact foveal projection, when opaque media preclude more conventional tests, could employ the VER.