Colour and luminance interactions in the visual perception of motion.

Willis, Alexandra and Anderson, Stephen J (2002) Colour and luminance interactions in the visual perception of motion. Proceedings of The Royal Society B Biological Sciences, 269 (1495). pp. 1011-1016. ISSN 1471 2954

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We sought to determine the extent to which red-green, colour-opponent mechanisms in the human visual system play a role in the perception of drifting luminance-modulated targets. Contrast sensitivity for the directional discrimination of drifting luminance-modulated (yellow-black) test sinusoids was measured following adaptation to isoluminant red-green sinusoids drifting in either the same or opposite direction. When the test and adapt stimuli drifted in the same direction, large sensitivity losses were evident at all test temporal frequencies employed (1-16 Hz). The magnitude of the loss was independent of temporal frequency. When adapt and test stimuli drifted in opposing directions, large sensitivity losses were evident at lower temporal frequencies (1-4 Hz) and declined with increasing temporal frequency. Control studies showed that this temporal-frequency-dependent effect could not reflect the activity of achromatic units. Our results provide evidence that chromatic mechanisms contribute to the perception of luminance-modulated motion targets drifting at speeds of up to at least 32°s-1. We argue that such mechanisms most probably lie within a parvocellular-dominated cortical visual pathway, sensitive to both chromatic and luminance modulation, but only weakly selective for the direction of stimulus motion.

Item Type: Article
Print ISSN: 1471 2954
Uncontrolled Keywords: colour; luminance; interactions; visual perception; motion; movement
University Divisions/Research Centres: Edinburgh Napier University, Transport Research Institute
Dewey Decimal Subjects: 100 Philosophy & psychology > 150 Psychology > 152 Perception, movement, emotions & drives
100 Philosophy & psychology > 150 Psychology > 150 Psychology
Library of Congress Subjects: B Philosophy. Psychology. Religion > BF Psychology
Item ID: 2239
Depositing User: RAE Import
Date Deposited: 08 Apr 2008 10:28
Last Modified: 20 Aug 2013 10:31

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