STUDIES ON THE INTRARETINAL ACTION POTENTIAL:PART III. INTRARETINAL NEGATIVE POTENTIAL AS COMPARED WITH <I>b</I>-WAVE IN THE ERG
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The intraretinal negative action potential and the <I>b</I>-wave in the ERG were subjected to the present research with the use of microillumination method on the bullfrog's eye.<BR>1. The intraretinal negative potential recorded from the illuminated retinal area was found to fall off sharply in the surrounding area. On the contrary, the <I>b</I>-wave usually showed a poor or no localization to the microillumination, being detectable almost everywhere on the retinal surface.<BR>2. <I>b</I>-wave elicited by a microillumination leaves behind a refractoriness not only to that focal retinal area but equally to the surrounding wide non-focal area. The effect of stray light upon the <I>b</I>-wave was discussed.<BR>3. Suggestion was made that the optic nerve discharge is more closely related to the intraretinal negative potential than to the <I>b</I>-wave.<BR>4. The <I>b</I>-wave or at least most part of it was found to originate in the bipolar cell layer.
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