Document Detail

Comparable effects of flickering and steady patterns of light adaptation on photomechanical responses of cones in amphibian (Xenopus laevis) retina.
MedLine Citation:
PMID:  10505606     Owner:  NLM     Status:  MEDLINE    
The effects of two distinct patterns of light stimulus, steady and flicker, on cone photomechanical movements (PMMs) in the Xenopus laevis retina were investigated. For both patterns studied, the effects on PMMs were assessed by quantitative analysis of the cone positions in the outer retina. Steady light adaptation was found to be equally effective as flicker in causing cone contractions. This was unlike the situation previously found in the cyprinid fish retina, in which flickering light was significantly more effective than steady. This difference could be related to the light-evoked response characteristics and circuitry of dopaminergic retinal neurones in the two vertebrate classes. The role of dopamine and other possible neuromodulator(s) in light adaptive control of vertebrate retinae is discussed.
A R Angotzi; J Hirano; S Haamedi; R Murgia; S Vallerga; M B Djamgoz
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience letters     Volume:  272     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-12-02     Completed Date:  1999-12-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  163-6     Citation Subset:  IM    
Department of Biology, Imperial College of Science, Technology and Medicine, London, UK.
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MeSH Terms
Adaptation, Ocular / physiology*
Dark Adaptation / physiology
Dopamine / physiology
Photic Stimulation*
Photoreceptor Cells / physiology*
Retinal Cone Photoreceptor Cells / physiology,  radiation effects*
Xenopus laevis

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