RESULTS

Configuration of intraretinal action potential. In Figure 2 is shown a series of recordings of the “on” and tr~ ff” responses obtained with the lowresistance microelectrode from the several retinal layers. The configurations of these responses, which are similar to those obtained from the spinal cord by Gasser and Graham (8), Eccles (6), and Brooks and Eccles (4) were identical with those obtained with the original high-resistance electrode (cf. Fig. 3), except that, with the improved electrode, spike discharges are superimposed on the slow potential. It is clearly illustrated in Figure 2 that the spikes are most easily detectable from the inner plexiform layer, whereas they can hardly be detected from the layers external to this. In a few excep-tional cases, however, small spikes were detected from the inner nuclear layer, and sometimes were well synchronized with the small slow oscillations which are most manifest around the outer plexiform layer. The responses are well reproducible and reversible in spite of repeated in-and out-excur-Configuration of intraretinal action potential. In Figure 2 is shown a series of recordings of the “on” and tr~ ff” responses obtained with the lowresistance microelectrode from the several retinal layers. The configurations of these responses, which are similar to those obtained from the spinal cord by Gasser and Graham (8), Eccles (6), and Brooks and Eccles (4) were identical with those obtained with the original high-resistance electrode (cf. Fig. 3), except that, with the improved electrode, spike discharges are superimposed on the slow potential. It is clearly illustrated in Figure 2 that the spikes are most easily detectable from the inner plexiform layer, whereas they can hardly be detected from the layers external to this. In a few exceptional cases, however, small spikes were detected from the inner nuclear layer, and sometimes were well synchronized with the small slow oscillations which are most manifest around the outer plexiform layer. The responses are well reproducible and reversible in spite of repeated in-and out-excur-