D. ALFRED OWENS is Professor of Psychology at Franklin & Marshall College. He is co-author of Sensorimotor Interactions in Space Perception and Action (1987) and Emergent Techniques for Assessment of Visual Performance (1985) and has written for journals, including Perception and Psychophysics, Journal of the Optical Society of America, American Scientist, Science, and Vision Research.

MARK WAGNER is Assistant Professor of Psychology at Wagner College. He has published in Perception and Psychophysics, The Behavioral and Brain Sciences, and the Journal of Experimental Psychology.

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