Failure of signed chromatic apparent motion with luminance masking |
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Authors: | Yoshizawa Tatsuya Mullen Kathy T Baker Curtis L |
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Affiliation: | Department of Ophthalmology, McGill Vision Research, McGill University, 687 Pine Avenue West, Room H4-14, Que., H3A 1A1, Montreal, Canada. |
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Abstract: | It has been suggested that there are two types of chromatic motion mechanisms: signed chromatic motion, in which correspondence across successive frames is based on chromatic content of image regions, and unsigned chromatic motion based on movement of chromatically-defined borders. We investigate whether signed and unsigned red-green chromatic motion are mediated by a genuinely chromatic mechanism. Direction discrimination of signed and unsigned red-green chromatic motion were measured in the presence of a dynamic luminance masking noise. Increasing the luminance noise contrast systematically impaired signed motion, regardless of contrast and speed. This result suggests that signed red-green chromatic motion is derived from a luminance-based signal, rather than a genuinely chromatic motion mechanism. In the case of unsigned chromatic motion, there is no effect of luminance masking noise, indicating there exists a genuine chromatic mechanism for second-order motion perception. |
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Keywords: | Color Motion Chromatic motion Second-order Non-Fourier Nonlinear |
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