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Titolo:
Ultraviolet colour opponency in the turtle retina
Autore:
Ventura, DF; Zana, Y; De Souza, JM; Devoe, RD;
Indirizzi:
Univ Sao Paulo, Inst Psicol, Dept Psicol Expt, BR-05508900 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-05508900 BC05508900 Sao Paulo, Brazil Univ Sao Paulo, Ctr Neurociencias & Comportamento, BR-05508900 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-05508900 BC05508900 Sao Paulo, Brazil Indiana Univ, Sch Optometry, Bloomington, IN USA Indiana Univ BloomingtonIN USA Univ, Sch Optometry, Bloomington, IN USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 14, volume: 204, anno: 2001,
pagine: 2527 - 2534
SICI:
0022-0949(200107)204:14<2527:UCOITT>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLORLESS OIL DROPLETS; FRESH-WATER TURTLES; HORIZONTAL CELLS; VISUAL PIGMENTS; ELECTROPHYSIOLOGICAL MEASUREMENTS; SPECTRAL SENSITIVITIES; CONE PHOTORECEPTORS; PSEUDEMYS-SCRIPTA; SYNAPTIC CONTACTS; GANGLION-CELLS;
Keywords:
ultraviolet vision; spectral sensitivity; colour vision; turtle; retina; intracellular recording;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Ventura, DF Univ Sao Paulo, Inst Psicol, Dept Psicol Expt, BR-05508900 SaoPaulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-05508900 BC Paulo, Brazil
Citazione:
D.F. Ventura et al., "Ultraviolet colour opponency in the turtle retina", J EXP BIOL, 204(14), 2001, pp. 2527-2534

Abstract

We have examined the functional architecture of the turtle Pseudemys scripta elegans retina with respect to colour processing, extending spectral stimulation into the ultraviolet, which has not been studied previously in theinner retina. We addressed two questions. (i) Is it possible to deduce theultraviolet cone spectral sensitivity function through horizontal cell responses? (ii) Is there evidence for tetrachromatic neural mechanisms, i.e. UV/S response opponency? Using a constant response methodology we have isolated the ultraviolet cone input into the S/LM horizontal cell type and described it in fine detail. Monophasic (luminosity), biphasic L/M (red-green) and triphasic S/LM (yellow-blue) horizontal cells responded strongly to ultraviolet light. The blue-adapted spectral sensitivity function of a S/LM cell peaked in the ultraviolet and could be fitted to a porphyropsin cone template with a peak at 372nm. In the inner retina eight different combinations of spectral opponency were found in the centre of the receptive field of ganglion cells. Among amacrine cells the only types found were UVSM-L+ and its reverse. One amacrine and four ganglion cells were also opponent in the receptive field surround. UV/S opponency, seen in three different types of ganglion cell, provides aneural basis for discrimination of ultraviolet colours. In conclusion, theresults strongly suggest that there is an ultraviolet channel and a neuralbasis for tetrachromacy in the turtle retina.

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Documento generato il 30/10/20 alle ore 08:23:37