Response times to Ehrenstein illusions of varying subjective magnitude: complementarity of psychophysical measures |
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Authors: | Pins D Bonnet C Dresp B |
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Institution: | Université Louis Pasteur, Strasbourg, France. pins@alsace.u-strasbg.fr |
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Abstract: | The following experiments investigate the effects of contrast polarity, inducer spacing, and inducer type on three dependent
variables measuring the perception of an illusory surface in Ehrenstein figures: subjective magnitude, response time, and
frequency of perception. It was found that response time generally decreased when the other two behavioral indicators increased.
However, it was also shown that subjective magnitude provided more discriminating measures of relatively strong illusory percepts,
whereas frequency of perception and response time provided more discriminating measures of relatively weak illusory percepts.
The findings generally confirm earlier work on the effect of inducer spacing and contrast polarity on the perceived strength
of brightness illusions, and in particular reveal the complementarity of subjective magnitude, response time, and frequency
of perception as critical measures of configurational effects in the perceptual processing of these phenomena. Thanks are
due to J. E. Hoffman, T. Parks, and an anonymous referee for their insightful comments and suggestions on an earlier version
of this paper. |
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