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Titolo:
Responses of neurons in the cat posteromedial lateral suprasylvian cortex to moving texture patterns
Autore:
Merabet, L; Minville, K; Ptito, M; Casanova, C;
Indirizzi:
Univ Montreal, Ecole Optometrie, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ie, Montreal, PQ H3C 3J7, Canada Univ Montreal, Ctr Rech Sci Neurol, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ol, Montreal, PQ H3C 3J7, Canada
Titolo Testata:
NEUROSCIENCE
fascicolo: 4, volume: 97, anno: 2000,
pagine: 611 - 623
SICI:
0306-4522(2000)97:4<611:RONITC>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTERIOR-PULVINAR COMPLEX; RECEPTIVE-FIELD PROPERTIES; STRIATE-RECIPIENT ZONE; SIMULATED OPTIC FLOW; RANDOM-DOT PATTERNS; VISUAL-CORTEX; EXTRASTRIATE CORTEX; RETINOTOPIC ORGANIZATION; FUNCTIONAL-ORGANIZATION; CORTICAL CONNECTIONS;
Keywords:
visual noise; extrastriate cortex; direction selectivity; motion sensitivity; receptive field properties; texture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Casanova, C Univ Montreal, Ecole Optometrie, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada Univ Montreal CP 6128,Succ Ctr Ville Montreal PQ Canada H3C 3J7
Citazione:
L. Merabet et al., "Responses of neurons in the cat posteromedial lateral suprasylvian cortex to moving texture patterns", NEUROSCIENC, 97(4), 2000, pp. 611-623

Abstract

The posteromedial lateral suprasylvian cortex represents a point of convergence between the geniculostriate and extrageniculostriate visual pathways. Given its purported role in motion analysis and the conflicting reports regarding the texture sensitivity of this area, we have investigated the response properties of cells in PMLS to moving texture patterns ("visual noise"). In contrast to previous reports, we have found that a large majority of cells (80.1%) responds to the motion of a texture pattern with sustained discharges. In general, responses to noise were more broadly tuned for direction compared to gratings; however, direction selectivity appeared more pronounced in response to noise. The majority of cells was selective for drift velocity of the noise pattern (mean optimal velocity: 26.7 degrees/s). Velocity tuning was comparable to that of its principal thalamic input, the lateral posterior pulvinar nucleus. In general, responsiveness of cells in theposteromedial lateral suprasylvian cortex increased with increasing texture element size, although some units were tuned to smaller element sizes than the largest presented. Finally, the magnitude of these noise responses was dependent on the area of the visual field stimulated. In general, a stimulus corresponding to roughly twice the size of the receptive field was required to elicit an equivalent half-maximal response to that for gratings. The results of this study indicate that the majority of cells in the posteromedial lateral suprasylvian cortex can be driven by the motion of a fine texture field, and highlight the importance of this area in motion analysis. (C) 2000 IBRO. Published by Elsevier Science Ltd.

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Documento generato il 18/09/20 alle ore 19:12:31