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Titolo:
Neural selectivity for hue and saturation of colour in the primary visual cortex of the monkey
Autore:
Hanazawa, A; Komatsu, H; Murakami, I;
Indirizzi:
Natl Inst Physiol Sci, Neural Control Lab, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 , Okazaki, Aichi 444, Japan
Titolo Testata:
EUROPEAN JOURNAL OF NEUROSCIENCE
fascicolo: 5, volume: 12, anno: 2000,
pagine: 1753 - 1763
SICI:
0953-816X(200005)12:5<1753:NSFHAS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
LATERAL GENICULATE-NUCLEUS; FOVEAL STRIATE CORTEX; RECEPTIVE-FIELDS; CHROMATIC MECHANISMS; CARDINAL DIRECTIONS; TEMPORAL CORTEX; MACAQUE MONKEY; AWAKE MONKEY; NEURONS; AREA;
Keywords:
inferior temporal cortex; lateral geniculate nucleus; macaque monkey; V1;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Komatsu, H Natl Inst Physiol Sci, Neural Control Lab, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 Aichi 444, Japan
Citazione:
A. Hanazawa et al., "Neural selectivity for hue and saturation of colour in the primary visual cortex of the monkey", EUR J NEURO, 12(5), 2000, pp. 1753-1763

Abstract

In the inferior temporal (IT) cortex of monkeys, which has been shown to play a critical role in colour discrimination, there are neurons sensitive to a narrow range of hues and saturation. By contrast, neurons in the retinaand the parvocellular layer of the lateral geniculate nucleus (pLGN) encode colours in a way that does not provide explicit representation of hue or saturation, and the process by which hue- and saturation-selectivity is elaborated remains unknown. We therefore tested the colour-selectivity of neurons in the primary visual cortex (V1) and compared it with those of pLGN and IT neurons. Quantitative analysis was performed using a standard set of colours, systematically distributed within the CIE (Commission Internationale de l'Eclairage)-xy chromaticity diagram. Selectivity for hue and saturation was characterized by analysing response contours reflecting the overall distribution of responses across the chromaticity diagram. We found that the response contours of almost all pLGN neurons were linear and broadly tuned for hue. Many V1 neurons behaved similarly; nonetheless, a considerable number of V1 neurons had clearly curved response contours and were selectivefor a narrow range of hues or saturation. The relative frequencies of neurons exhibiting various selectivities for hue and saturation were remarkablysimilar in the V1 and IT cortex, but were clearly different in the pLGN. Thus, V1 apparently plays a very important role in the conversion of colour signals necessary for generating the elaborate colour selectivity observed in the IT cortex.

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Documento generato il 30/11/20 alle ore 03:33:37