Surajit Nundy

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Although it has long been apparent that observers tend to overestimate the magnitude of acute angles and underestimate obtuse ones, there is no consensus about why such distortions are seen. Geometrical modeling combined with psychophysical testing of human subjects indicates that these misperceptions are the result of an empirical strategy that resolves(More)
Many otherwise puzzling aspects of the way we see brightness, colour, orientation and motion can be understood in wholly empirical terms. The evidence reviewed here leads to the conclusion that visual percepts are based on patterns of reflex neural activity shaped entirely by the past success (or failure) of visually guided behaviour in response to the same(More)
The perceptions of lightness or brightness elicited by a visual target are linked to its luminance by a nonlinear function that varies according to the physical characteristics of the target and the background on which it is presented. Although no generally accepted explanation of this scaling relationship exists, it has long been considered a byproduct of(More)
Recent work on brightness, color, and form has suggested that human visual percepts represent the probable sources of retinal images rather than stimulus features as such. Here we investigate the plausibility of this empirical concept of vision by allowing autonomous agents to evolve in virtual environments based solely on the relative success of their(More)
motion, both the orientation and the axis of motion were different by 908 between the subtracted stimuli. For example, the response to a texture with 458 oriented bars moving horizontally was subtracted from the response to a texture with 1358 oriented bars moving vertically. Results obtained with difference imaging were verified with single-condition(More)
NAZZARENO BALLATORI,1 DAVID N. HAGER,2 SURAJIT NUNDY,3 DAVID S. MILLER,4 AND JAMES L. BOYER5,6 1Department of Environmental Medicine, University of Rochester School of Medicine, Rochester 14642; 2Cornell University Medical College, New York, New York 10021; 3Washington University School of Medicine, St. Louis, Missouri 63110; 4Laboratory of Pharmacology and(More)
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