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Titolo:
SPATIAL SUMMATION AND ITS INTERACTION WITH THE TEMPORAL INTEGRATION MECHANISM IN HUMAN MOTION PERCEPTION
Autore:
FREDERICKSEN RE; VERSTRATEN FAJ; VANDEGRIND WA;
Indirizzi:
MCGILL VIS RES,H414,687 PINE AVE W MONTREAL H3A 1A1 PQ CANADA UNIV UTRECHT,UTRECHT BIOPHYS RES INST UTRECHT NETHERLANDS UNIV UTRECHT,DEPT COMPARAT PHYSIOL UTRECHT NETHERLANDS UNIV N CAROLINA,DEPT COMP SCI CHAPEL HILL NC 27515
Titolo Testata:
Vision research
fascicolo: 23, volume: 34, anno: 1994,
pagine: 3171 - 3188
SICI:
0042-6989(1994)34:23<3171:SSAIIW>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANDOM-DOT PATTERNS; MONOCULAR VISUAL-FIELD; COHERENT MOTION; WHITE NOISE; DETECTABILITY; SELECTIVITY; CONTRAST; CORTEX; MT;
Keywords:
SPATIAL SUMMATION; TEMPORAL INTEGRATION; MOTION PERCEPTION; APPARENT MOTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
R.E. Fredericksen et al., "SPATIAL SUMMATION AND ITS INTERACTION WITH THE TEMPORAL INTEGRATION MECHANISM IN HUMAN MOTION PERCEPTION", Vision research, 34(23), 1994, pp. 3171-3188

Abstract

The combination of visual motion information over visual space (spatial summation) and stimulus duration (temporal integration) was investigated using a random-pixel array (spatiotemporally broad-band) apparent motion stimulus designed to isolate specific populations of visual motion detectors. The results indicate that, in agreement with results from spatiotemporally narrow-band stimuli, spatial summation follows the form of linear probabilistic summation rather than non-linear probabilistic summation. Linear probabilistic summation holds for a wide range of stimulus parameters and when changing either motion stimulus height or width. Linear probabilistic summation breaks down when the motion display region approaches a height and/or width that is related tothe spatial displacement size, not the speed, of the random-pixel array. This height and width (termed the critical height and width, or critical dimension), increases with spatial displacement size and can beinterpreted as a measure of the basic dimensions of the selected motion detector population's receptive field. The critical height is smaller than the critical width, a result that is consistent with a motion detector receptive field that is elongated in the direction of motion. Perhaps most importantly, the mechanisms of temporal integration and spatial summation can work independently under a wide range of conditions. Finally, the results provide evidence for a short-term inhibitoryphenomenon from the edges of the useful display area that affects thevisibility of the motion.

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Documento generato il 18/09/20 alle ore 19:31:18