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Titolo:
Visual motion of missing-fundamental patterns: motion energy versus feature correspondence
Autore:
Brown, RO; He, S;
Indirizzi:
Univ Minnesota, Dept Psychol, Minneapolis, MN 55455 USA Univ Minnesota Minneapolis MN USA 55455 sychol, Minneapolis, MN 55455 USA The Exploratorium, San Francisco, CA 94123 USA The Exploratorium San Francisco CA USA 94123 San Francisco, CA 94123 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 16, volume: 40, anno: 2000,
pagine: 2135 - 2147
SICI:
0042-6989(2000)40:16<2135:VMOMPM>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
APPARENT MOTION; HUMAN-VISION; SPATIAL-FREQUENCIES; COMPOUND GRATINGS; COHERENT MOTION; SHORT-RANGE; PERCEPTION; COLOR; MODEL; MOVEMENT;
Keywords:
motion energy; feature tracking; missing fundamental pattern; plaids; barberpole;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: He, S Univ Minnesota, Dept Psychol, 75 E River Rd, Minneapolis, MN 55455 USA Univ Minnesota 75 E River Rd Minneapolis MN USA 55455 , MN 55455 USA
Citazione:
R.O. Brown e S. He, "Visual motion of missing-fundamental patterns: motion energy versus feature correspondence", VISION RES, 40(16), 2000, pp. 2135-2147

Abstract

Missing-fundamental gratings, generated by subtracting the fundamental Fourier components from square-wave gratings, appear to move backward when presented in quarter-cycle jumps, even though their edges and features all move forward. We used variants of these stimuli to test current models of motion perception. We found that missing-fundamental plaids, constructed from orthogonal missing-fundamental gratings, also appear to move backward. Forward motion was restored to missing-fundamental gratings and plaids by addingback small fractions of the original fundamental. In-phase and antiphase addition of the fundamental had similar effects on the perceived motion, despite having markedly different effects on the features, appearances and zero-crossings of the stimuli. The critical amplitude of fundamental needed torestore forward motion to plaids was the same as that needed to restore forward motion to their isolated component gratings, indicating that the plaids' emergent features, such as edge intersections and 'blobs', made little or no contribution to the perceived direction of motion in these stimuli. In two derivative experiments, missing-fundamental chromatic gratings and plaids, at approximate isoluminance, and missing-fundamental luminance barberpoles, also generated backward perceived motions, and these were also reversed by in-phase or antiphase addition of small amounts of fundamental. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 03:56:20