Visual imagery lowers sensitivity to hue-varying,but not to luminance-varying,visual stimuli |
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Authors: | Adam Reeves |
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Affiliation: | 1. Institut für Arbeitsphysiologie an der Universit?it Dortmund, D-4600, Dortmund 1, West Germany
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Abstract: | Visual sensitivity (d′) is reduced if a subject is instructed to maintain a visual image while the target is presented (the Perky effect; Segal, 1971). This effect, typically .6 d’ units in magnitude for a colored target presented briefly on a uniform white background, is abolished if both target and background are white. (This was found with simple and complex visual images, and with FC and YN signal-detection methods.) It is concluded that visual imagery may lower the sensitivity of a psychophysical chromatic channel, but not that of an achromatic channel. |
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