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Titolo:
Contrast response characteristics of long-range lateral interactions in cat striate cortex
Autore:
Chen, CC; Kasamatsu, T; Polat, U; Norcia, AM;
Indirizzi:
Smith Kettlewell Eye Res Inst, San Francisco, CA 94115 USA Smith Kettlewell Eye Res Inst San Francisco CA USA 94115 co, CA 94115 USA
Titolo Testata:
NEUROREPORT
fascicolo: 4, volume: 12, anno: 2001,
pagine: 655 - 661
SICI:
0959-4965(20010326)12:4<655:CRCOLL>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMATE VISUAL-CORTEX; CORTICAL-NEURONS; SIMPLE CELLS; INPUTS; INTEGRATION; DEPENDENCE; AREA-17; LAYERS;
Keywords:
contrast response function; Gabor patches; gain control; sensitivity modulation; spatial summation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Kasamatsu, T Smith Kettlewell Eye Res Inst, 2318 Fillmore St, San Francisco, CA 94115 USA Smith Kettlewell Eye Res Inst 2318 Fillmore St San Francisco CA USA 94115
Citazione:
C.C. Chen et al., "Contrast response characteristics of long-range lateral interactions in cat striate cortex", NEUROREPORT, 12(4), 2001, pp. 655-661

Abstract

Single-cell responses in visual cortex to a target falling within their receptive field can be modified by collinear flanking stimuli concurrently presented outside the receptive field. Here, we report the presence of four types of contrast-dependent lateral effects: (1) facilitation at low target contrasts and suppression at high contrasts, (2) facilitation that increases with contrast, (3) suppression that increases with contrast, and (4) suppression at low contrasts with facilitation at high contrasts. We propose a sensitivity modulation model that accounts for all the four types of lateral effects by changes in two parameters. In this model, activation of neighboring neurons changes the sensitivities of the target neuron to both the direct feedforward input and inhibitory, divisive feedback from neighboring neurons. NeuroReport 12:655-661 (C) 2001 Lippincott Williams & Wilkins.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/06/20 alle ore 00:47:31