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Titolo:
Direction repulsion in unfiltered and ring-filtered Julesz textures
Autore:
Lindsey, DT;
Indirizzi:
Ohio State Univ, Dept Psychol, Mansfield, OH 44906 USA Ohio State Univ Mansfield OH USA 44906 t Psychol, Mansfield, OH 44906 USA
Titolo Testata:
PERCEPTION & PSYCHOPHYSICS
fascicolo: 2, volume: 63, anno: 2001,
pagine: 226 - 240
SICI:
0031-5117(200102)63:2<226:DRIUAR>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSPARENT MOTION PERCEPTION; SURFACE SEGMENTATION MECHANISMS; SPATIAL-FREQUENCY; COHERENT MOTION; VISUAL-MOTION; AREA MT; PATTERNS; VELOCITY; CONTRAST; SIGNALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Lindsey, DT Ohio State Univ, Dept Psychol, Mansfield, OH 44906 USA Ohio State Univ Mansfield OH USA 44906 ansfield, OH 44906 USA
Citazione:
D.T. Lindsey, "Direction repulsion in unfiltered and ring-filtered Julesz textures", PERC PSYCH, 63(2), 2001, pp. 226-240

Abstract

Perceived directions of motion were measured for each of two superposed two-dimensional dynamic random patterns consisting of unfiltered or ring-filtered dense random-check (Julesz) textures. One pattern always moved in a cardinal direction (up, down, left, or right), and the other texture always moved in an oblique direction separated from the cardinal component by 20 degrees -80 degrees. Several cardinal/oblique speed ratios were tested. In Experiment 1, the textures were unfiltered. In Experiment 2, the textures were ring filtered and had the same center frequency (1, 2, or 4 cpd). In Experiment 3, a 1-cpd ring-filtered texture was paired with a 2-, 4-, or 8-cpd texture. Subjects consistently misperceived the directions of component motion in these experiments; the angular separation of movement of the two textures was perceptually exaggerated, a phenomenon referred to as direction repulsion (Marshak & Sekuler, 1979). The results show that (1) direction repulsion occurs across at least a fourfold range of spatial frequencies and asixfold range of speed ratios, (2) direction repulsion varies systematically with speed ratio, and (3) across most conditions, direction repulsion isanisotropic-direction repulsion is more evident in the oblique directions than in the cardinal directions. These findings suggest that the spatiotemporal range of inhibitory interactions involved in motion transparency is much greater than previously appreciated.

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Documento generato il 25/11/20 alle ore 03:58:09