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Titolo:
Neural field model of receptive field restructuring in primary visual cortex
Autore:
Suder, K; Worgotter, F; Wennekers, T;
Indirizzi:
Ruhr Univ Bochum, Inst Physiol, Dept Neurophysiol, D-44780 Bochum, GermanyRuhr Univ Bochum Bochum Germany D-44780 physiol, D-44780 Bochum, Germany Max Planck Inst Math Sci, D-04103 Leipzig, Germany Max Planck Inst Math Sci Leipzig Germany D-04103 -04103 Leipzig, Germany
Titolo Testata:
NEURAL COMPUTATION
fascicolo: 1, volume: 13, anno: 2001,
pagine: 139 - 159
SICI:
0899-7667(200101)13:1<139:NFMORF>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORIENTATION SELECTIVITY; GENICULOCORTICAL AFFERENTS; DIRECTION SELECTIVITY; SYNAPTIC INTEGRATION; CORTICAL-NEURONS; STRIATE CORTEX; SIMPLE CELLS; AREA 17; CAT; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Suder, K Ruhr Univ Bochum, Inst Physiol, Dept Neurophysiol, D-44780 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44780 D-44780 Bochum, Germany
Citazione:
K. Suder et al., "Neural field model of receptive field restructuring in primary visual cortex", NEURAL COMP, 13(1), 2001, pp. 139-159

Abstract

Receptive fields (RF) in the visual cortex can change their size dependingon the state of the individual. This reflects a changing visual resolutionaccording to different demands on information processing during drowsiness. So far, however, the possible mechanisms that underlie these size changeshave not been tested rigorously. Only qualitatively has it been suggested that state-dependent lateral geniculate nucleus (LGN) firing patterns (burst versus tonic firing) are mainly responsible for the observed cortical receptive field restructuring. Here, we employ a neural field approach to describe the changes of cortical RF properties analytically. Expressions to describe the spatiotemporal receptive fields are given for pure feedforward networks. The model predicts that visual latencies increase nonlinearly with the distance of the stimulus location from the RF center. RF restructuring effects are faithfully reproduced. Despite the changing RF sizes, the modeldemonstrates that the width of the spatial membrane potential profile (as measured by the variances of a gaussian) remains constant in cortex. In contrast, it is shown for recurrent networks that both the RF width and the width of the membrane potential profile generically depend on time and can even increase if lateral cortical excitatory connections extend further than fibers from LGN to cortex. In order to differentiate between a feedforward and a recurrent mechanism causing the experimental RF changes, we fitted the data to the analytically derived point-spread functions. Results of the fits provide estimates for model parameters consistent with the literature data and support the hypothesis that the observed RF sharpening is indeed mainly driven by input from LGN, not by recurrent intracortical connections.

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Documento generato il 22/01/20 alle ore 19:08:26