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(Investigative Ophthalmology and Visual Science. 1962;1:122-126.)
© 1962 by The Association for Research in Vision and Ophthalmology, Inc.

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The Resonant Frequencies of Rod and Cone Electroretinograms

PETER GOURAS 1 and RALPH D. GUNKEL 1

1 National Institute of Neurological Diseases and Blindness, National Institutes of Health, Public Health Service, United States Department of Health, Education, and Welfare, Bethesda 14, Md.

The ERG of the albino rat and the gray squirrel was studied tuith sinusoidally flickering light and D.C. amplification. It was found that: The rat's ERG has a resonant frequency of 2 to 4 c.p.s. ivith attenuation at both lower and higher frequencies; the bandwidth of the response extends from 0.05 to 25 c.p.s. The squirrel's ERG has a resonant frequency of 9 to 10 c.p.s. with a bandwidth of approximately 1 to 100 c.p.s. Increasing the light intensity broadens the bandwidth but does not shift the resonant frequency greatly. Analogies are made between the response of these pure rod and cone retinas and the low-frequency characteristics of human vision.






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Copyright © 1962 by the Association for Research in Vision and Ophthalmology