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Titolo:
A model for the intracortical origin of orientation preference and tuning in macaque striate cortex
Autore:
Adorjan, P; Levitt, JB; Lund, JS; Obermayer, K;
Indirizzi:
Tech Univ Berlin, FB Informat, D-10587 Berlin, Germany Tech Univ Berlin Berlin Germany D-10587 nformat, D-10587 Berlin, Germany UnivdColl London, Inst Ophthalmol, Dept Visual Sci, London EC1V 9EL, Englan Univ Coll London London England EC1V 9EL al Sci, London EC1V 9EL, Englan
Titolo Testata:
VISUAL NEUROSCIENCE
fascicolo: 2, volume: 16, anno: 1999,
pagine: 303 - 318
SICI:
0952-5238(199903/04)16:2<303:AMFTIO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAT VISUAL-CORTEX; SIMPLE RECEPTIVE-FIELDS; FUNCTIONALLY CHARACTERIZED SITES; GABA-MEDIATED INHIBITION; SIMPLE CELLS; DIRECTION SELECTIVITY; SPATIAL-FREQUENCY; POSTSYNAPTIC POTENTIALS; CROSS-CORRELATION; CORTICAL-NEURONS;
Keywords:
computational model; macaque; orientation selectivity; receptive field; spatial frequency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
92
Recensione:
Indirizzi per estratti:
Indirizzo: Adorjan, P Techrmany Berlin, FB Informat, FR 2-1,Franklinstr 28-29, D-10587 Berlin, Ge Tech Univ Berlin FR 2-1,Franklinstr 28-29 Berlin Germany D-10587
Citazione:
P. Adorjan et al., "A model for the intracortical origin of orientation preference and tuning in macaque striate cortex", VIS NEUROSC, 16(2), 1999, pp. 303-318

Abstract

We report results of numerical simulations for a model of generation of orientation selectivity in macaque striate cortex. In contrast to previous models, where the initial orientation bias is generated by convergent geniculate input to simple cells and subsequently sharpened by lateral circuits, our approach is based on anisotropic intracortical excitatory connections which provide both the initial orientation bias and its subsequent amplification. Our study shows that the emerging response properties are similar to the response properties that are observed experimentally, hence the hypothesis of an intracortical generation of orientation bias is a sensible alternative to the notion of an afferent bias by convergent geniculocortical projection patterns. In contrast to models based on an afferent orientation bias, however, the "intracortical hypothesis" predicts that orientation tuning gradually evolves from an initially nonoriented response and a complete loss of orientation tuning when the recurrent excitation is blocked, but new experiments must be designed to unambiguously decide between both hypotheses.

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Documento generato il 11/07/20 alle ore 21:04:00