Simultaneous brightness contrast as a function of practice

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Gary McClure (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site:
Kendon Smith

Abstract: The present investigation was addressed to the question of whether or not the illusion of simultaneous brightness contrast is susceptible to a practice effect as are the Poggendorff, Zoellner, and Mueller-Lyer illusions. A nativistic, or peripheral, explanation of brightness contrast would predict no change in the degree of the illusion as a consequence of practice. An empiricistic, or central, explanation would predict a decrement in the degree of the contrast effect following successive practice trials. Five Ss, 3 male and 2 female students of advanced status in the University, participated. Using the method of adjustment, each S attempted to equate the brightness of an adjustable field with that of a standard field of 1 ft.-L. luminance. On each of 10 consecutive days, S rendered: (1) 10 control comparisons in the absence of any contrast effect, and (2) 50 experimental judgments, during which the standard field was surrounded by an inducing field of 4 ft.-L. luminance.

Additional Information

Language: English
Date: 1968
Brightness perception
Brightness perception $x Experiments

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