Occipital distribution of foveal half-field responses.

Foveal left and right half-field responses were recorded in six subjects (12 half-fields) and compared with wide half-field responses. In the foveal responses a general trend was seen for the negative-positive-negative (NPN) complex to extend to the contralateral channels, replacing the contralateral positive-negative-positive (PNP) complex found with wide half-field stimulation. Many individual variations in foveal response morphology were seen, which may be understood in terms of anatomical variation. Individual differences between foveal half-fields in the same subject may be as great as those between subjects.