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Titolo:
Detection and discrimination of chromatic targets in hemianopic macaque monkeys and humans
Autore:
Cowey, A; Stoerig, P;
Indirizzi:
Univ Oxford, Dept Expt Psychol, Oxford OX1 3UD, England Univ Oxford Oxford England OX1 3UD Expt Psychol, Oxford OX1 3UD, England Univ Dusseldorf, Inst Physiol Psychol, D-40225 Dusseldorf, Germany Univ Dusseldorf Dusseldorf Germany D-40225 , D-40225 Dusseldorf, Germany
Titolo Testata:
EUROPEAN JOURNAL OF NEUROSCIENCE
fascicolo: 8, volume: 14, anno: 2001,
pagine: 1320 - 1330
SICI:
0953-816X(200110)14:8<1320:DADOCT>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETINAL GANGLION-CELLS; LATERAL GENICULATE-NUCLEUS; STRIATE CORTEX; PRIMATE RETINA; SPECTRAL SENSITIVITY; VISUAL-PERCEPTION; RHESUS-MONKEY; COLOR-VISION; BLINDSIGHT; ABSENCE;
Keywords:
blindsight; colour; striate cortex; visual field defects;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Cowey, A Univ Oxford, Dept Expt Psychol, S Parks Rd, Oxford OX1 3UD, England Univ Oxford S Parks Rd Oxford England OX1 3UD d OX1 3UD, England
Citazione:
A. Cowey e P. Stoerig, "Detection and discrimination of chromatic targets in hemianopic macaque monkeys and humans", EUR J NEURO, 14(8), 2001, pp. 1320-1330

Abstract

We measured the ability of three macaque monkeys with unilateral removal of primary visual cortex to detect 9 degrees, 200-ms targets presented at random in the upper or lower quadrants of the normal and hemianopic visual fields. The white or variously coloured target could differ from the background in both colour and luminance, or in either of them. Blue and red targetswere detectable at any luminance contrast, but green and white targets were barely or not at all detectable at and near isoluminance in the hemianopic field. Blue and red targets were better detected than white targets at the same luminance difference. However, when both the target and the background were dynamically luminance-masked, detection in the hemianopic field failed at isoluminance whatever the colour. In addition, the monkeys were unable to discriminate between simultaneously presented red and green or blue and green targets in the hemianopic field when both targets had similar luminance contrast with the background. Two hemianopic patients tested on a subset of the tasks performed similarly to the monkeys. Together, the results indicate that the residual colour-opponent system that survives damage to V1 is involved in the detection of chromatic changes but cannot sustain simultaneous discrimination between pairs of colours.

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Documento generato il 20/01/20 alle ore 15:58:33