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Titolo:
A TRANSPARENT MOTION AFTEREFFECT CONTINGENT ON BINOCULAR DISPARITY
Autore:
VERSTRATEN FAJ; VERLINDE R; FREDERICKSEN RE; VANDEGRIND WA;
Indirizzi:
UTRECHT BIOPHYS RES INST,PADUALAAN 8 3584 CH UTRECHT NETHERLANDS UTRECHT BIOPHYS RES INST,PADUALAAN 8 3584 CH UTRECHT NETHERLANDS MCGILL VIS RES UNIT MONTREAL PQ H3A 1A1 CANADA DEPT COMPARAT PHYSIOL 3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Perception
fascicolo: 10, volume: 23, anno: 1994,
pagine: 1181 - 1188
SICI:
0301-0066(1994)23:10<1181:ATMACO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOVEMENT; DIRECTION; PATTERNS; NOISE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
F.A.J. Verstraten et al., "A TRANSPARENT MOTION AFTEREFFECT CONTINGENT ON BINOCULAR DISPARITY", Perception, 23(10), 1994, pp. 1181-1188

Abstract

Under transparent motion conditions overlapping surfaces are perceived simultaneously, each with its own direction. The motion aftereffect (MAE) of transparent motion, however, is unidirectional and its direction is opposite to that of a sensitivity-weighted vector sum of both inducing vectors. Here we report a bidirectional and transparent MAE contingent on binocular disparity. Depth (from retinal disparity) was introduced between two patterns. A fixation dot was presented at zero disparity, that is, located between the two adaptation patterns. After adaptation to such a stimulus configuration testing was carried out with two stationary test patterns at the same depths as the preceding moving patterns. For opposite directions a clear transparent MAE was perceived. However, if the adaptation directions were orthogonal the chance of a transparent MAE being perceived decreased substantially. This was subject dependent. Some subjects perceived an orthogonal transparent MAE whereas others saw the negative vector sum-an integrated MAE. Inaddition the behaviour of the MAE when the distance in depth between adapting and test patterns was increased was investigated: it was found that the visibility of the MAE then decreased. Visibility is definedin this paper as: (i) the percentage of the trials in which MAEs are perceived and (ii) the average MAE duration. Both measures decreased with increasing distance. The results suggest that segregation and integration may be mediated by direction-tuned channels that interact withdisparity-tuned channels.

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Documento generato il 27/11/20 alle ore 01:54:14