Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Modulation of the synchronization between cells in visual cortex by contextual targets
Autore:
Bretzner, F; Aitoubah, J; Shumikhina, S; Tan, YF; Molotchnikoff, S;
Indirizzi:
Univ Montreal, Dept Sci Biol, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ol, Montreal, PQ H3C 3J7, Canada
Titolo Testata:
EUROPEAN JOURNAL OF NEUROSCIENCE
fascicolo: 9, volume: 14, anno: 2001,
pagine: 1539 - 1554
SICI:
0953-816X(200111)14:9<1539:MOTSBC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-CORRELATION ANALYSIS; OSCILLATORY NEURONAL RESPONSES; MONKEY STRIATE CORTEX; SCENE SEGMENTATION; INTEGRATION FIELD; CORTICAL-NEURONS; MACAQUE MONKEY; CAT; CONNECTIVITY; DISCRIMINATION;
Keywords:
area 17; cats; neuronal code; receptive field; synchronization of spikes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Molotchnikoff, S Univ Montreal, Dept Sci Biol, CP 6128,Succursale Ctr Ville, Montreal, PQ H3C 3J7, Canada Univ Montreal CP 6128,Succursale Ctr Ville Montreal PQ Canada H3C 3J7
Citazione:
F. Bretzner et al., "Modulation of the synchronization between cells in visual cortex by contextual targets", EUR J NEURO, 14(9), 2001, pp. 1539-1554

Abstract

It has been suggested that synchronization of action potentials encodes diverse features of a single image. However, properties of the synchronization, which occurs on a time scale of approximate to 1-5 ms, are still poorly understood. We have tested the modulation of synchronization by manipulating the contextual targets introduced in the surround of the receptive field. Experiments were carried out on anaesthetized cats prepared for multiunit and single-cell recordings in area 17. Initially, a patch of sine-wave drifting grating was positioned over the overlapping receptive fields of several neurons. If this coherent motion produced a significant synchronization in cross-correlograms, contextual targets were added. The first contextual stimuli were two sine-wave patches placed above and below the central compound receptive field. Only the contrast of contextual targets changed. Results show that the larger the differential contrast the higher the synchronization. The second contextual stimulus was a lateral shift of a sinewave patch. Data show that the wider the distance between the central and peripheralpatches the better the synchronization. Furthermore, results suggest that the synchrony pattern computed by cross correlating multiunit recordings from two sites differs when the cross correlation is carried out between individual units belonging to each multiunit recording. Together with our previous results it appears that synchronization is stimulus dependent and its strength increases with larger disparities included in the whole stimulatingimage.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 00:40:43