Tetrachromatic input to turtle horizontal cells

Visual Neuroscience
Y ZanaR D Devoe

Abstract

Recent physiological experiments support behavioral and morphological evidence for a fourth type of cone in the turtle retina, maximally sensitive in the ultraviolet (UV). This cone type has not yet been included in the models proposed for connectivity between cones and horizontal cells. In this study, we examined the inputs of UV, S, M, and L cones to horizontal cells. We used the high-resolution Dynamic Constant Response Method to measure the spectral sensitivity of horizontal cells without background light and after adaptation to UV, blue (B), green (G), and red (R) light. We concluded the following: (1) Tetrachromatic input to a Y/B horizontal cell was identified. The spectral-sensitivity curves of the cell in three of the adaptation conditions were well represented by L-, M-, and S-cone functions. Adaptation to blue light revealed a peak at 372 nm, the same wavelength location as that determined behaviorally in the turtle. A porphyropsin template could be closely fitted to the sensitivity band in that region, strong evidence for input from a UV cone. (2) The spectral-sensitivity functions of R/G horizontal cells were well represented by the L- and M-cone functions. There was no indication of UV- or S-cone inputs into these...Continue Reading

Citations

Feb 25, 2003·Progress in Retinal and Eye Research·Gilad TwigIdo Perlman
Jul 5, 2008·Visual Neuroscience·F A F RochaD F Ventura
Aug 25, 2010·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Christina JoselevitchDora Fix Ventura
Nov 26, 2010·Molecular Ecology·Adam R SmithKaren L Carleton
May 15, 2012·Progress in Retinal and Eye Research·Wallace B Thoreson, Stuart C Mangel
Jan 23, 2016·PloS One·Fernando Allan de Farias RochaDora Fix Ventura
Sep 12, 2006·Visual Neuroscience·Marlison José L De AguiarBarry B Lee
May 30, 2019·Physiological Reviews·Wallace B Thoreson, Dennis M Dacey
Dec 9, 2003·Visual Neuroscience·Gilad TwigIdo Perlman
Dec 1, 2019·The Journal of Comparative Neurology·Sonia Regina GrötznerDora Fix Ventura
Jun 22, 2019·Annual Review of Vision Science·T Baden, D Osorio
Oct 15, 2019·Biological Reviews of the Cambridge Philosophical Society·Wilfredo FalcónDennis M Hansen

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