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Titolo:
TEMPORAL-CHROMATIC INTERACTIONS IN LGN P-CELLS
Autore:
LANKHEET MJM; LENNIE P; KRAUSKOPF J;
Indirizzi:
UNIV UTRECHT,DEPT COMPARAT PHYSIOL,PADUALAAN 8 NL-3584 CH UTRECHT NETHERLANDS UNIV ROCHESTER,CTR VISUAL SCI ROCHESTER NY 14627
Titolo Testata:
Visual neuroscience
fascicolo: 1, volume: 15, anno: 1998,
pagine: 47 - 54
SICI:
0952-5238(1998)15:1<47:TIILP>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETINAL GANGLION-CELLS; LATERAL GENICULATE-NUCLEUS; LUMINANCE FLICKER; MACAQUE; RESPONSES; CONE; SENSITIVITY; CAT; FIELD; MECHANISMS;
Keywords:
P-CELLS; LATERAL GENICULATE NUCLEUS (LGN); MACAQUE MONKEY; CHROMATIC PROPERTIES; TEMPORAL PROPERTIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M.J.M. Lankheet et al., "TEMPORAL-CHROMATIC INTERACTIONS IN LGN P-CELLS", Visual neuroscience, 15(1), 1998, pp. 47-54

Abstract

We studied the interaction between the chromatic and temporal properties of parvocellular (P) neurons in the lateral geniculate nucleus (LGN) of macaque monkeys. We measured the amplitudes and phases of responses to stimulation by spatially uniform fields modulated sinusoidally about a white point in a three-dimensional color space, at a range of temporal frequencies between 1 and 25 Hz. Below about 4 Hz, temporal frequency had relatively little effect on chromatic tuning. At higher frequencies chromatic opponency was weakened in almost all cells. The complex interactions between temporal and chromatic properties are represented by a linear filter model that describes response amplitude andphase as a function of temporal frequency and direction in color space along which stimuli are modulated. The model stipulates the cone inputs to center and surround, their temporal properties, and the linear combination of center and surround signals. It predicts the amplitudesand phases of responses of P-cells, and the change of chromatic properties with temporal frequency. We used the model to investigate whether or not the chromatic signature of the surround in a red-green cell could be estimated from the change in the cell's chromatic properties with temporal frequency. Our findings could be equally well described by mixed cone surrounds as by pure cone surrounds, and we conclude that, with regard to temporal properties, there is no benefit to be gainedby segregating cone classes in center and surround.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 08:08:55