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Dark-suppression and light-sensitization of horizontal cell responses in the hybrid bass retina

Published online by Cambridge University Press:  02 June 2009

William H. Baldridge ,
Reto Weiler  and
John E. Dowling
William H. Baldridge
Affiliation:
The Marine Biological Laboratory, Woods Hole
Reto Weiler
Affiliation:
The Marine Biological Laboratory, Woods Hole
John E. Dowling
Affiliation:
The Marine Biological Laboratory, Woods Hole
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Abstract

The responsiveness of luminosity-type horizontal cells, recorded intracellularly from isolated hybrid bass retinas, decreased after superfusion for 2 h in constant darkness. Responsiveness was subsequently increased (light-sensitized) up to 10-fold after exposure to several short (~0.5 min) periods of continuous illumination. The increase in horizontal cell responsiveness following light-sensitization was due to an increase of peak response amplitude rather than a reduction of peak response time. The increased responsiveness after light-sensitization was intensity-dependent with brighter sensitizing stimuli causing a greater increase than dimmer stimuli. The extent of LHC dark-suppression was affected by the time of day, being greater when induced during the night than during the day. However, there was no significant difference in horizontal cell responsiveness after light-sensitization in retinas studied during the night compared to those studied during the day The responsiveness of light-sensitized horizontal cells from isolated hybrid bass retinas was found to be suppressed by relatively brief periods of darkness. The responsiveness of horizontal cells, that were first light-sensitized, decreased by more than 50% following only 5 min of darkness. Suppression of light-sensitized horizontal cell responsiveness after such a short time in the dark has not been described in other teleost retinas. The suppression of light-sensitized horizontal cell responsiveness in hybrid bass retinas may be rapid in comparison to other teleosts.

Keywords

RetinaHorizontal cellsDarknessResponsivenessHybrid bass
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 4 , July 1995 , pp. 611 - 620
Copyright
Copyright © Cambridge University Press 1995

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