These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Light adaptation and responses to contrast flashes in cones of the walleye retina.
    Author: Burkhardt DA, Gottesman J.
    Journal: Vision Res; 1987; 27(9):1409-20. PubMed ID: 3445477.
    Abstract:
    The effects of light adaptation on the intracellular responses of cones to incremental and decremental light flashes were investigated in the superfused walleye retina. The time course of light adaptation was relatively slow, some 10-20 min being required to reach steady-state conditions. Under steady-state conditions: (1) both dark-adapted and light-adapted amplitude/intensity data were well described by the Michaelis-Menten relation, (2) the incremental response did not saturate on intense backgrounds and (3) the cone sensitivity conformed closely to Weber's law. Effects of the polarity and magnitude of the flash contrast were analyzed by deriving "equivalent contrast" relations for cones and comparing the results to those of recent psychophysical experiments. Results based on the response amplitude suggest that responses to negative contrast flashes may be enhanced by post-receptor mechanisms. Results based on cone latency suggest that equivalent contrast relations for visual latency may be largely shaped in the very early, quasi-linear phase of the cone response.
    [Abstract] [Full Text] [Related] [New Search]