Electroretinographic evidence for a photopic system in the rat

Robert W. Massof, Arthur E. Jones

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12 Scopus citations


It was found that the rat generates a bimodal b-wave amplitude by wavelength function and a bimodal luminosity curve with maxima at 510 and 570-600 nm. The secondary maximum is relatively unaffected by green and blue adaptation, but it is suppressed with red adaptation. It was also learned that b-wave implicit time varies as a function of wavelength with minima at 480 nm and 540 nm, and as a function of intensity with an apparent rod-cone break at 500 nm but not at 600 nm. A prominent x-wave, isolated from the b-wave, was observed at short wavelengths with a maximum amplitude at 480 nm. It was hypothesized that the rat possesses a photopic system, perhaps mediated by rhodopsin. Also, the presence of a long wavelength sensitive receptor pigment, which mediates the "red response", was postulated and the nature of such a receptor was discussed.

Original languageEnglish (US)
Pages (from-to)1231-1239
Number of pages9
JournalVision Research
Issue number7
StatePublished - Jul 1972
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems


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