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Titolo:
MOTION INTEGRATION WITH DOT PATTERNS - EFFECTS OF MOTION NOISE AND STRUCTURAL INFORMATION
Autore:
LORENCEAU J;
Indirizzi:
UNIV PARIS 05,CNRS,EXPT PSYCHOL LAB,28 RUE SERPENTE F-75006 PARIS FRANCE
Titolo Testata:
Vision research
fascicolo: 21, volume: 36, anno: 1996,
pagine: 3415 - 3427
SICI:
0042-6989(1996)36:21<3415:MIWDP->2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPORAL VISUAL AREA; COHERENT MOTION; RECEPTIVE-FIELD; GLOBAL MOTION; PERCEPTION; SIGNALS; MT; TRANSPARENCY; SEGMENTATION; DIRECTION;
Keywords:
MOTION INTEGRATION; MOTION SEGMENTATION; RELATIVE MOTION; PERCEPTUAL ORGANIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
J. Lorenceau, "MOTION INTEGRATION WITH DOT PATTERNS - EFFECTS OF MOTION NOISE AND STRUCTURAL INFORMATION", Vision research, 36(21), 1996, pp. 3415-3427

Abstract

To better understand how local motion detectors merge their responsesso as to permit the global determination of objects' movements in thevisual field, direction discrimination performance was measured usinga flexible class of moving dots-two sets of dots translating sinusoidally 90 deg out of phase along orthogonal axes, When dots' velocities are combined, a global motion along a circular trajectory emerges, clockwise or counter-clockwise depending on the sign of the phase lag, However, the results of the present experiments indicate that dot patterns are segregated into distinct, but interacting, streams when each dot motion can be accurately determined. In contrast, perceptual coherence of the global motion occurs when each local motion signal is ''blurred'' by a ''motion noise'', Direction discrimination performance thenincreases regularly with both noise amplitude and noise frequency, i.e., noise speed, Performance also increases when relative motion between dots is added, Testing different dot configurations indicates that performance is better for spatial arrangements that display structuralproperties (a square shape), as compared to overlapping random distributions, Interestingly, when the delay between stimulus onset and motion onset increases up to 300 msec, performance improves when dot patterns convey some form of structural organization but not when the dots are distributed at random, Relations of these results to existing models of motion integration are considered, Copyright (C) 1996 Elsevier Science Ltd.

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Documento generato il 02/12/20 alle ore 05:24:04