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Titolo:
THE PERCEIVED DIRECTION OF TEXTURED GRATINGS AND THEIR MOTION AFTEREFFECTS
Autore:
ALAIS D; VANDERSMAGT MJ; VERSTRATEN FAJ; VANDEGRIND WA;
Indirizzi:
VANDERBILT UNIV,DEPT PSYCHOL,DAVID K WILSON HALL NASHVILLE TN 37240 MACQUARIE UNIV,SCH BEHAV SCI,DEPT PSYCHOL SYDNEY NSW 2109 AUSTRALIA UNIV UTRECHT,HELMHOLTZ INST,DEPT COMPARAT PHYSIOL 3584 CH UTRECHT NETHERLANDS HARVARD UNIV,DEPT PSYCHOL CAMBRIDGE MA 02138
Titolo Testata:
Perception
fascicolo: 12, volume: 24, anno: 1995,
pagine: 1383 - 1396
SICI:
0301-0066(1995)24:12<1383:TPDOTG>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISTRIBUTION-SHIFT MODEL; SINGLE-CELL PROPERTIES; MONKEY STRIATE CORTEX; SPATIAL WHITE NOISE; VISUAL DETECTABILITY; OPTIC FLOW; PERCEPTION; ADAPTATION; MOVEMENT; NEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
D. Alais et al., "THE PERCEIVED DIRECTION OF TEXTURED GRATINGS AND THEIR MOTION AFTEREFFECTS", Perception, 24(12), 1995, pp. 1383-1396

Abstract

The stimuli in these experiments are square-wave luminance gratings with an array of small random dots covering the high-luminance regions. Owing to the texture, the direction of these gratings, when seen through a circular aperture, is disambiguated because the visual system isprovided with an unambiguous motion energy. Thus, the direction of textured gratings can be varied independently of grating orientation. When subjects are required to judge the direction of textured gratings moving obliquely relative to their orientation, they can do so accurately (experiment 1). This is of interest because most studies of one-dimensional motion perception have involved (textureless) luminance-defined sine-wave or square-wave gratings, and the perceived direction of these gratings is constrained by the aperture problem to be orthogonal to their orientation. Thus, direction and orientation have often been confounded. Interestingly, when subjects are required to judge the direction of an obliquely moving textured grating during a period of adaptation and then the direction of the motion aftereffect (MAE) immediately following adaptation (experiments 2 and 3), these directions are not directly opposite each other. MAE directions were always more orthogonal to the orientation of the adapting grating than the corresponding direction judgments during adaptation (by as much as 25 degrees). These results are not readily explained by conventional MAE models and possible accounts are considered.

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Documento generato il 03/12/20 alle ore 05:32:29