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The action spectra of cone photoreceptors in the turtle (Mauremys caspica) retina

Published online by Cambridge University Press:  02 June 2009

Ido Perlman
Affiliation:
The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology and the Rappaport Family Institute for Research in the Medical Science, Haifa, Israel
Aviran Itzhaki
Affiliation:
The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology and the Rappaport Family Institute for Research in the Medical Science, Haifa, Israel
Shoshana Malik
Affiliation:
The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology and the Rappaport Family Institute for Research in the Medical Science, Haifa, Israel
Mathew Alpern
Affiliation:
The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology and the Rappaport Family Institute for Research in the Medical Science, Haifa, Israel

Abstract

Cone photoreceptors in the turtle retina are involved in intricate neuronal interactions with other retinal neurons that modify the responses of the cones to photons absorbed in their outer segments. Therefore, the action spectra of cones strongly depend upon the conditions of measurements. This study describes an attempt to derive the action spectra of turtle cones which are the least distorted by neuronal interactions. To achieve this goal, the photoresponses of cones and horizontal cells were recorded from the turtle retina under different conditions of adaptation using different patterns of the stimulating test flashes. The sensitivity action spectra, derived from small-amplitude (<1 mV) photoresponses, were strongly affected by the recording conditions indicating the contributions of multiple neuronal inputs. Action spectra, constructed from large criterion photoresponses, were less distorted by neuronal interactions and better described the spectral properties of the “isolated” cones. The action spectra of the hyperpolarizing inputs to chromaticity-type horizontal cells were derived by stimulating these cells with mixtures of a saturating red light and a monochromatic light of different wavelength and intensity. The action spectra were constructed from the intensity of the addend component needed to “pull down” the depolarizing response to the red component by a fixed criterion. These spectra, measured in red/green and yellow/blue C-type horizontal cells, are suggested to best represent the “isolated” M-cones and S-cones, respectively.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1994

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