The e-wave of the electroretinogram was recorded intraretinally from dark-adapted frog eyecups. e-Wave latency was roughly proportional to log stimulus intensity, varying from 2 to 65 sec. The delayed response of ganglion cell units (types 3 and 4) began simultaneously with the e-wave. The e-wave response had similar latencies as the onset of the decay phase of the saturated rod response (determined by recording the mass receptor response and by monitoring b-wave threshold). These results suggest that the e-wave and the delayed ganglion cell response represent closely-linked retinal phenomena which are initiated by rod response decay.
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Acknowiedgements-This researchw as supportedi n part by the National Institutes of Health (Grant 5 TOI EYCC090a) nd m part by a grant from the Bell Telephone LaboratoriesI nc. We thank Dr Edward R. Gruberg and Dr StephenA . Raymondf or their valuablea ssistanced ur-ing the course of this work and for reviewingt he text. and Arbella Chase for her help in preparingt he manuscript.