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Titolo:
AN ANALYSIS OF 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: 3153 - 3170
SICI:
0042-6989(1994)34:23<3153:AAOTTI>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONOCULAR VISUAL-FIELD; SPATIAL WHITE NOISE; APPARENT MOTION; CORTEX; RANGE; DETECTABILITY; SELECTIVITY; SUMMATION; MOVEMENT; ENERGY;
Keywords:
MOTION PERCEPTION; TEMPORAL INTEGRATION; MODELING; MOTION DETECTOR POPULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R.E. Fredericksen et al., "AN ANALYSIS OF THE TEMPORAL INTEGRATION MECHANISM IN HUMAN MOTION PERCEPTION", Vision research, 34(23), 1994, pp. 3153-3170

Abstract

We present a model for the temporal integration of apparent motion information. The model is constructed by considering psychophysical and neurophysiological data, and consists of the leaky integration of pulsatile motion detector responses to apparent motion stimuli. Each pulserepresents a motion detector populational response to a discrete spatial displacement of the spatial pattern. Temporal contrast sensitivitydetermines the shape of constant-stimulus-duration threshold curves for image frame exposure durations less than about 133 msec. The shape of the threshold curve for image frame exposure durations greater thanabout 133 msec is determined by the leaky integrator time constant and the shape of the pulses emitted by the motion detectors. The leaky integrator model exhibits threshold saturation behaviour (the reaching of a maximum sensitivity or minimum threshold) seen in psychophysical data as well as dependence of saturation time on the frame rate of theapparent motion stimulus. A low frame rate results in a longer time-to-saturation because the leaky integrator discharges more between detector output pulses. When the motion detector output pulses are far enough apart there is effectively no temporal integration and therefore no threshold improvement over time. Finally, the behaviour of the psychophysical threshold curves across spatial displacement sizes is consistent with a populational-response threshold mechanism combined with spatial summation over a non-uniform distribution of detector types across the visual field.

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Documento generato il 27/11/20 alle ore 01:51:20