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Titolo:
Perceived motion in orientational afterimages: direction and speed
Autore:
Francis, G; Kim, H;
Indirizzi:
Purdue Univ, Dept Psychol Sci, W Lafayette, IN 47907 USA Purdue Univ W Lafayette IN USA 47907 ychol Sci, W Lafayette, IN 47907 USA Univ Calif Irvine, Dept Cognit Sci, Irvine, CA 92697 USA Univ Calif Irvine Irvine CA USA 92697 pt Cognit Sci, Irvine, CA 92697 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 2, volume: 41, anno: 2001,
pagine: 161 - 172
SICI:
0042-6989(2001)41:2<161:PMIOAD>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
VISUAL PERSISTENCE; CORTICAL DYNAMICS; SPATIAL-FREQUENCY; NEURAL DYNAMICS; RESET; PERCEPTION; MACAQUE; FORM;
Keywords:
after-effect; motion direction; motion speed; neural networks; visual persistence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Francis, G Hanse Wissenschaftskolleg, Lehmkuhlenbusch 4, D-27753 Delmenhorst, Germany Hanse Wissenschaftskolleg Lehmkuhlenbusch 4 Delmenhorst Germany D-27753
Citazione:
G. Francis e H. Kim, "Perceived motion in orientational afterimages: direction and speed", VISION RES, 41(2), 2001, pp. 161-172

Abstract

Two sets of experiments demonstrate new properties of motion in orientational after-effects. In a previous report, we showed that when observers adapted to a static bar grating whose elements varied in size or intensity fromone side to the other, offset of the grating resulted in a motion after-effect, with the perceived motion in the direction of the largest or most intense bar. In the first new experiment, we show that similar results can be produced by varying the duration of the bar elements, with the direction ofthe motion after-effect toward the bar with the longest duration. In the second new experiment we demonstrate that the perceived speed of the motion aftereffect is influenced by the spatial extent of the after-effect, with larger extents corresponding to faster speeds. The experimental findings arediscussed in the context of a neural network theory of visual perception, in this theory, a moving oriented contour leaves a trail of activity among cortical cells tuned to orthogonal orientations. We hypothesize that the grating stimuli produce after-effects that mimic the pattern of oriented responses produced by a true moving contour, and the visual system interprets this pattern as a cue for motion. We also show how the model connects the properties of these motion after-effects to properties of visual persistence. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 01/04/20 alle ore 20:54:07