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Related Experiment Videos

Turtle C-type horizontal cells act as push-pull devices.

G Twig1, H Levy, I Perlman

  • 1Department of Physiology and Biophysics, Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Rappaport Institute, Haifa.

Visual Neuroscience
|May 22, 2002
PubMed
Summary
This summary is machine-generated.

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Chromaticity (C-type) horizontal cells in turtles exhibit push-pull responses. Background light alters their voltage range but not maximal or minimal potential levels, demonstrating adaptive color opponency.

Area of Science:

  • Neuroscience
  • Vision Science
  • Retinal Physiology

Background:

  • C-type horizontal cells in vertebrates mediate color opponency.
  • These cells receive input from cone photoreceptors with different spectral sensitivities.
  • Ambient illumination can influence cone photoreceptor contribution and cell properties.

Purpose of the Study:

  • To investigate the impact of chromatic background illumination on color opponency in turtle C-type horizontal cells.
  • To analyze changes in photoresponses of Red/Green and Yellow/Blue horizontal cells under varying light conditions.

Main Methods:

  • Utilized an everted eyecup preparation of the turtle Mauremys caspica.
  • Recorded photoresponses of C-type horizontal cells to long and short-wavelength stimuli.

Related Experiment Videos

  • Applied dark-adapted and chromatic background illumination conditions.

    • Main Results:

    • The total voltage range for photoresponses varied with background light color.
    • Maximal hyperpolarizing and depolarizing potentials remained constant irrespective of background.
    • These stable potential limits suggest a push-pull mechanism.

    Conclusions:

    • Turtle C-type horizontal cells function as push-pull devices.
    • Color opponency is adaptable to background illumination, maintaining stable response limits.
    • This mechanism ensures robust visual processing across different light environments.