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Titolo:
MAGNITUDE OF LUMINANCE MODULATION SPECIFIES AMPLITUDE OF PERCEIVED MOVEMENT
Autore:
ALLIK J; PULVER A;
Indirizzi:
TARTU STATE UNIV,DEPT PSYCHOL,78 TIIGI ST TARTU ESTONIA
Titolo Testata:
Perception & psychophysics
fascicolo: 1, volume: 57, anno: 1995,
pagine: 27 - 34
SICI:
0031-5117(1995)57:1<27:MOLMSA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANDOM-DOT PATTERNS; APPARENT MOTION; SPATIAL-FREQUENCY; VISUAL-SYSTEM; REACTION-TIME; PERCEPTION; MODEL; DISCRIMINATION; DIRECTION; CONTRAST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
J. Allik e A. Pulver, "MAGNITUDE OF LUMINANCE MODULATION SPECIFIES AMPLITUDE OF PERCEIVED MOVEMENT", Perception & psychophysics, 57(1), 1995, pp. 27-34

Abstract

A compelling impression of movement, which is perceptually indistinguishable from a real displacement, can be elicited by patterns containing no spatially displaced elements. An apparent oscillation, w-movement, was generated by a stationary pattern containing a large number of horizontal pairs of spatially adjacent dots modulated in brightness. The observer's task was to adjust the perceived amplitude of the w-motion to match the amplitude of a real oscillation. All of the data can be accounted for by a simple rule: If the relative change in the luminance, W = Delta L/L, between two adjacent stationary dots is kept constant, the distance over which these dots appeared to travel in space comprises a fixed fraction of the total distance by which they are separated. The apparent amplitude of the w-motion increases strictly in proportion with luminance contrast, provided that the contrast is represented in the motion-encoding system by a rapidly saturating compressiveWeibull transformation. These findings can be explained in terms of bilocal motion encoders comparing two luminance modulations occurring at two different locations.

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Documento generato il 18/09/20 alle ore 20:07:06