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Titolo:
Flexible cortical gamma-band correlations suggest neural principles of visual processing
Autore:
Eckhorn, R; Bruns, A; Saam, M; Gail, A; Gabriel, A; Brinksmeyer, HJ;
Indirizzi:
Univ Marburg, Dept Phys, Neurophys Grp, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 ophys Grp, D-35032 Marburg, Germany
Titolo Testata:
VISUAL COGNITION
fascicolo: 3-5, volume: 8, anno: 2001,
pagine: 519 - 530
SICI:
1350-6285(200106/10)8:3-5<519:FCGCSN>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
FAST OSCILLATIONS; SPIKING NEURONS; STRIATE CORTEX; LOW-FREQUENCY; AWAKE MONKEY; MODEL; SYNCHRONIZATION; INTEGRATION; COHERENCE; RESPONSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Eckhorn, R Univ Marburg, Dept Phys, Neurophys Grp, Renthof 7, D-35032 Marburg, Germany Univ Marburg Renthof 7 Marburg Germany D-35032 arburg, Germany
Citazione:
R. Eckhorn et al., "Flexible cortical gamma-band correlations suggest neural principles of visual processing", VIS COGN, 8(3-5), 2001, pp. 519-530

Abstract

We summarize recent studies of our group from the primary visual cortex V1of behaving monkeys referring to the hypothesis of spatial feature bindingby gamma -synchronization (30-90 Hz). In agreement with this hypothesis the data demonstrates decoupling of gamma -activities among neural groups representing figure and ground. As gamma -synchronization in V1 is restricted to cortical ranges of few millimeters, feature binding may equivalently be restricted in visual space. Closer inspection shows that the restriction insynchrony is due to far-reaching travelling gamma -waves with changing phase coupling. Based on this observation we extend the initial binding-by-synchronization hypothesis and suggest object continuity to be coded by phase continuity. It is further argued that the spatial phase changes of the V1 gamma -waves in general will also limit lateral phase coupling to higher levels of processing. Instead of phase-locked gamma -coupling, corticocorticalcooperation among gamma -processes may be mediated by mutual amplitude modulations that are more reliable than phase synchrony over larger distances. The relevance of this concept of corticocortical binding is demonstrated with subdural recordings from human subjects performing cognitive tasks. Theexperimental results are discussed on the basis of network models with spiking neurons.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 14:41:33