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  • Title: Light adaptation of rod and cone luminosity horizontal cells of the retina of the goldfish.
    Author: Malchow RP, Yazulla S.
    Journal: Brain Res; 1988 Mar 08; 443(1-2):222-30. PubMed ID: 3359267.
    Abstract:
    Intracellular recordings from rod horizontal cells and luminosity external horizontal cells of the goldfish retina were obtained, and the process of light adaptation induced by steady, full-field background illumination was investigated. Rod horizontal cells had remarkably steep response vs intensity (rvi) functions when dark-adapted. Background illumination reduced the sensitivity of these cells primarily due to response compression, with intense backgrounds resulting in eventual response saturation. Increment threshold functions for these cells were non-linear, and increment saturation was evident when 500-nm backgrounds exceeded 10.5 log photons s-1 cm-2. Cone luminosity cells displayed broad response operating functions when dark-adapted. Light adaptation resulted in substantial narrowing of the rvi function, as well as a shift in the operating function to greater intensities. Response compression played only a minor role in the loss of sensitivity of these cells.
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