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Titolo:
Energy model for contrast detection: spatial-frequency and orientation selectivity in grating summation
Autore:
Manahilov, V; Simpson, WA;
Indirizzi:
Glasgow Caledonian Univ, Dept Vis Sci, Glasgow G4 0BA, Lanark, Scotland Glasgow Caledonian Univ Glasgow Lanark Scotland G4 0BA , Lanark, Scotland
Titolo Testata:
VISION RESEARCH
fascicolo: 12, volume: 41, anno: 2001,
pagine: 1547 - 1560
SICI:
0042-6989(200105)41:12<1547:EMFCDS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROBABILITY SUMMATION; VISUAL NOISE; PATTERNS; SENSITIVITY; VISIBILITY; CHANNELS; MASKING; VISION;
Keywords:
energy model; multiple-channels model; orientation selectivity; spatial-frequency selectivity; subthreshold summation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Manahilov, V Glasgow Caledonian Univ, Dept Vis Sci, City Campus,CowcaddensRd, Glasgow G4 0BA, Lanark, Scotland Glasgow Caledonian Univ City Campus,Cowcaddens Rd Glasgow Lanark Scotland G4 0BA
Citazione:
V. Manahilov e W.A. Simpson, "Energy model for contrast detection: spatial-frequency and orientation selectivity in grating summation", VISION RES, 41(12), 2001, pp. 1547-1560

Abstract

Models of spatial vision usually assume a 'front-end' of spatial-frequencyand orientation selective channels. Subthreshold-summation studies have provided some of the strongest support for this notion. We applied a single-channel energy model and a multiple-channels probability-summation model to explore subthreshold-summation phenomena. We measured the contrast thresholds for detection of two superimposed Gabor patches as a function of the spatial-frequency and orientation difference between the components. The stimuli were centred 7.5 deg above the fixation point and were windowed by a Gaussian function with one of two different spatial spreads. We have shown that the spatial-frequency and orientation selectivity in subthreshold summation of Gabor patches is determined by the similarity (cross-correlation) between the stimulus components. A single-channel energy model as well as a multiple-channels probability-summation model could explain the summation data. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 09:01:58