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Luminance and color effects on localization of briefly flashed visual stimuli

Published online by Cambridge University Press:  02 June 2009

Roger E. Graves
Roger E. Graves
Affiliation:
Department of Psychology, University of Victoria
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Abstract

Visual localization was studied by flashing small stimuli on a green background and requiring observers to press keys to indicate whether the stimulus appeared to the left or right of fixation. The results suggest that, for small (0.25 deg) briefly flashed (17 ms) stimuli at an eccentric location (10 deg), color contrast is not useable and localization presumably must rely on the magnocellular pathway. When stimulus size and duration were increased at 10-deg eccentricity, isochromatic stimuli could be localized at less than 10% luminance contrast (again suggesting use of the magnocellular high sensitivity luminance-contrast system), but isoluminant color-contrast stimuli could also be localized (suggesting use of the color-contrast sensitive parvocellular system). Thus, the results indicate that, dependent on stimulus conditions, both magnocellular and parvocellular pathways were utilized by normal observers in this localization task.

Keywords

Visual localizationIsoluminanceMagnocellularSmall flashesChromatic detectionLuminance detection
Type
Research Articles
Information
Visual Neuroscience , Volume 13 , Issue 3 , May 1996 , pp. 567 - 573
Copyright
Copyright © Cambridge University Press 1996

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