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Titolo:
RESPONSES TO MOVING TEXTURE PATTERNS OF CELLS IN THE STRIATE-RECIPIENT ZONE OF THE CATS LATERAL POSTERIOR-PULVINAR COMPLEX
Autore:
CASANOVA C; SAVARD T;
Indirizzi:
UNIV MONTREAL,ECOLE OPTOMETRIE,CP 6128,SUCC CTR VILLE MONTREAL PQ H3C3J7 CANADA UNIV SHERBROOKE,FAC MED,DEPT SURG OPHTHALMOL SHERBROOKE PQ J1H 5N4 CANADA UNIV SHERBROOKE,FAC MED,DEPT PHYSIOL & BIOPHYS SHERBROOKE PQ J1H 5N4 CANADA
Titolo Testata:
Neuroscience
fascicolo: 2, volume: 70, anno: 1996,
pagine: 439 - 447
SICI:
0306-4522(1996)70:2<439:RTMTPO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADJACENT THALAMIC NUCLEI; FELINE VISUAL-CORTEX; RANDOM-DOT PATTERNS; DIFFERENTIAL RESPONSIVENESS; RECEPTIVE-FIELDS; TECTO-RECIPIENT; CORTICAL AREAS; STIMULI; NEURONS; CONNECTIONS;
Keywords:
AREA 17; COMPLEX CELLS; LP NUCLEUS; MOTION SENSITIVITY; THALAMUS; VISUAL NOISE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
C. Casanova e T. Savard, "RESPONSES TO MOVING TEXTURE PATTERNS OF CELLS IN THE STRIATE-RECIPIENT ZONE OF THE CATS LATERAL POSTERIOR-PULVINAR COMPLEX", Neuroscience, 70(2), 1996, pp. 439-447

Abstract

We have studied the response properties of cells in the lateral part of the lateral posterior nucleus or striate-recipient zone (LP1) of the lateral posterior nucleus-pulvinar complex to the motion of texturedpatterns [visual noise]. Our purpose was to determine basic noise response characteristics and to compare these properties to that of cellsin area 17 known to project to the LP1. Practically all LP1 cells (87%) responded to the motion of visual noise. The evoked discharges wereeither sustained or characterized by several bursts. On average, as found in cortex, LP1 neurons were more broadly tuned for the direction of noise than that of gratings (bandwidths of 49 and 36 degrees, respectively; t-test, P < 0.005). Noise tuning function in LP1 was comparable to that found in cortex (mean of 48 degrees). One third of the LP1 units did not exhibit any preferences for drift direction of noise. Such cells were virtually not encountered in the striate cortex. This group of LP1 cells was generally not tuned for grating direction. For practically all LP1 cells, responses to noise varied as a function of drift velocity. The mean optimal velocity was 27.5 degrees/s with mean bandwidth of 2.5 octaves. LP1 cells were sensitive to a broader range of velocities than complex cells in area 17. The results of the presentstudy showed that visual noise is an appropriate stimulus for studying motion sensitivity of cells in the LP1. It also revealed that the noise response properties, such as direction and velocity tuning functions, are very similar to those reported in the striate cortex. The exact contribution of area 17 in the visual noise responsiveness of LP1 cells remains to be determined. This study provides additional evidence that the lateral posterior nucleus-pulvinar complex may be involved inmany aspects of visual processing.

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Documento generato il 18/09/20 alle ore 18:00:51