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Titolo:
DYNAMICAL CELL ASSEMBLY HYPOTHESIS - THEORETICAL POSSIBILITY OF SPATIOTEMPORAL CODING IN THE CORTEX
Autore:
FUJII H; ITO H; AIHARA K; ICHINOSE N; TSUKADA M;
Indirizzi:
KYOTO SANGYO UNIV,DEPT INFORMAT & COMMUN SCI KYOTO 603 JAPAN UNIV TOKYO TOKYO 113 JAPAN TAMAGAWA UNIV MACHIDA TOKYO JAPAN
Titolo Testata:
Neural networks
fascicolo: 8, volume: 9, anno: 1996,
pagine: 1303 - 1350
SICI:
0893-6080(1996)9:8<1303:DCAH-T>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
OSCILLATORY NEURONAL RESPONSES; CORTICAL MEMORY SYSTEM; PRIMARY VISUAL-CORTEX; SHORT-TERM-MEMORY; INFEROTEMPORAL CORTEX; COMPUTATIONAL ARCHITECTURE; COHERENT OSCILLATIONS; SYNAPTIC CONNECTIONS; NEOCORTICAL NEURONS; PATTERN SENSITIVITY;
Keywords:
CARRIER OF INFORMATION; SPATIOTEMPORAL CODING; DYNAMICAL CEN ASSEMBLY; BINDING PROBLEM; INFORMATION REPRESENTATION; COINCIDENCE DETECTOR NEURON; SYNCHRONOUS OSCILLATION; CORRELATION CODING; FUNCTIONAL CONNECTIVITY;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
CompuMath Citation Index
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
144
Recensione:
Indirizzi per estratti:
Citazione:
H. Fujii et al., "DYNAMICAL CELL ASSEMBLY HYPOTHESIS - THEORETICAL POSSIBILITY OF SPATIOTEMPORAL CODING IN THE CORTEX", Neural networks, 9(8), 1996, pp. 1303-1350

Abstract

This paper is an attempt to understand how knowledge and events are represented and processed in the brain. An important point is the question of what carries information in the brain - the mean firing rate orthe timing of spikes? The idea we want to pursue is that, contrary tothe traditional view, the brain might use higher order statistics, which means in essence that timing of spikes plays a critical role in encoding, representing, and processing knowledge and events in the brain. A recently revealed salient nature of cortical pyramidal cells, i.e., the high variability of inter-spike intervals suggests that a cortical neuron may function effectively as a coincidence detector. At the same time, non-classical experimental phenomena of task-related, short time-scaled dynamical modulations of temporal correlations between neurons suggest a non-classical view on the dynamics working in the brain. In response to contexts or external events, a group of neurons, a dynamical cell assembly, spontaneously organizes, linked temporarily by coincident timing of incident spikes, showing correlated firing with each other. This is an emergent property of neuronal populaton in the cortex. We make a theoretical exploration on issues as (1) the description of such emergent dynamics of dynamical cell assemblies based on the working hypothesis that a cortica neuron functions effectively as a coincidence detector, and (2) the principle of spatio-temporal coding based on the hypothetical emergent dynamics. Note that the conventional rate coding hypothesis does not give satisfactory answers to fundamental questions on the representation and processing of knowledge or events in the brain, e.g., the questions of cross-modular integration ofinformation or the binding problem, and representation of hierarchical knowledge etc. The first goal is to give a non-encyclopedic review on (1) the temporal structure of spike sequences,focusing on the question of the basic code in the brain; (2) the paradigms on representationof knowledge and events proposed from a theoretical or experimental basis. The classical paradigms of Hebb and Barlow with their experimental and theoretical critiques, and more recently proposed experiment-based paradigms are reviewed. Also a review is given on (3) the experimentally observed spatio-temporal structure of spike dynamics. The second goal is to give a description of the dynamical cell assembly - the central concept in this paper. Aside from the question of physiologicalbasis, we make a theoretical study, under a working hypothesis that acortical neuron functions effectively as a coincidence detector, on the emergent dynamics of cell assemblies, and also examine howl the observed experimental data could be explained within this theoretical setting. We also try to give the principle of spatio-temporal coding based on the dynamical cell assembly framework. A key concept is the internal mechanism of ''dialogue'' among neuronal pools in the brain. This provides a dynamical foundation of bi-directional interactions for thelinkage of distant modules to create integrated information. We present a simple model in order to illustrate the working principle of coincidence detector systems. Relations with other temporal coding paradigms me also discussed. Copyright (C) 1996 Elsevier Science Ltd.

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Documento generato il 08/04/20 alle ore 09:11:00