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Titolo:
Detection of contrast-defined shape
Autore:
Hess, RF; Achtman, RL; Wang, YZ;
Indirizzi:
McGill Vis Res, Montreal, PQ H3A 1A1, Canada McGill Vis Res Montreal PQ Canada H3A 1A1 s, Montreal, PQ H3A 1A1, Canada Retina Fdn SW, Dallas, TX 75231 USA Retina Fdn SW Dallas TX USA 75231Retina Fdn SW, Dallas, TX 75231 USA
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 9, volume: 18, anno: 2001,
pagine: 2220 - 2227
SICI:
1084-7529(200109)18:9<2220:DOCS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARTESIAN GRATINGS; SPATIAL-FREQUENCY; 2ND-ORDER MOTION; VISUAL-CORTEX; NEURONS; DISCRIMINATION; PSYCHOPHYSICS; SENSITIVITY; ORIENTATION; SELECTIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Hess, RF McGill Vis Res, Room H4-14,687 Pine Ave W, Montreal, PQ H3A 1A1, Canada McGill Vis Res Room H4-14,687 Pine Ave W Montreal PQ Canada H3A 1A1
Citazione:
R.F. Hess et al., "Detection of contrast-defined shape", J OPT SOC A, 18(9), 2001, pp. 2220-2227

Abstract

We assessed the accuracy of contrast-defined shape detection of stimuli ofconstant aspect ratio, namely, circular bandpass stimuli whose radii were sinusoidally varied about a mean radius. Performance for these contrast-defined shapes, which we show is determined by the global rather than the local attributes of the stimulus, is 2-8 times worse than that for their luminance-defined counterparts, suggesting separate processing limitations. By spatially and orientationally filtering the two-dimensional fractal-noise carriers of which these stimuli were composed, we determined whether there arespecific rules concerning the spatial and orientational input to shape detectors from mechanisms sensitive to the carrier structure. The results suggest that second-order circularity detectors receive mixed input from spatial-frequency-tuned and orientationally tuned cells. (C) 2001 Optical Societyof America.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 08:32:43