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Titolo:
Noise-tolerant stimulus discrimination by synchronization with depressing synapses
Autore:
Fukai, T; Kanemura, S;
Indirizzi:
Tamagawa Univ, Dept Informat Commun Engn, Tokyo 1948610, Japan Tamagawa Univ Tokyo Japan 1948610 rmat Commun Engn, Tokyo 1948610, Japan
Titolo Testata:
BIOLOGICAL CYBERNETICS
fascicolo: 2, volume: 85, anno: 2001,
pagine: 107 - 116
SICI:
0340-1200(200108)85:2<107:NSDBSW>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEOCORTICAL PYRAMIDAL NEURONS; SYNAPTIC DEPRESSION; VISUAL-CORTEX; DYNAMIC SYNAPSES; CORTICAL-NEURONS; MOTOR CORTEX; INFORMATION; NETWORK; CELLS; INTERNEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Fukai, T Tamagawa Univ, Dept Informat Commun Engn, 6-1-1 Tamagawagakuen, Tokyo 1948610, Japan Tamagawa Univ 6-1-1 Tamagawagakuen Tokyo Japan 194861010, Japan
Citazione:
T. Fukai e S. Kanemura, "Noise-tolerant stimulus discrimination by synchronization with depressing synapses", BIOL CYBERN, 85(2), 2001, pp. 107-116

Abstract

Some synapses between cortical pyramidal neurons exhibit a rapid depression of excitatory postsynaptic potentials for successive presynaptic spikes. Since depressing synapses do not transmit information on sustained presynaptic firing rates, it has been speculated that they are favorable for temporal coding. In this paper, we study the dynamical effects of depressing synapses on stimulus-induced transient synchronization in a simple network of inhibitory interneurons and excitatory neurons, assuming that the recurrent excitation is mediated by depressing synapses. This synchronization occurs in a temporal pattern which depends on a given stimulus. Since the presenceof noise is always a potential hazard in temporal coding, we investigate the extent to which noise in stimuli influences the synchronization phenomena. It is demonstrated that depressing synapses greatly contribute to suppressing the influences of noise on the stimulus-specific temporal patterns ofsynchronous firing. The timing-based Hebbian learning revealed by physiological experiments is shown to stabilize the temporal patterns in cooperation with synaptic depression. Thus, the times at which synchronous firing occurs provides a reliable information representation in the presence of synaptic depression.

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Documento generato il 22/01/20 alle ore 09:59:10