S-cone contributions to linear and non-linear motion processing |
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Authors: | Michna Magda L Yoshizawa Tatsuya Mullen Kathy T |
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Institution: | Department of Ophthalmology, McGill Vision Research, McGill University, Montreal, Que., Canada H3A 1A1. magda.michna@mcgill.ca |
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Abstract: | We investigated the characteristics of mechanisms mediating motion discrimination of S-cone isolating stimuli and found a double dissociation between the effects of luminance noise, which masks linear but not non-linear motion, and chromatic noise, which masks non-linear but not linear motion. We conclude that S-cones contribute to motion via two different pathways: a non-linear motion mechanism via a chromatic pathway and a linear motion mechanism via a luminance pathway. Additionally, motion discrimination and detection thresholds for drifting, S-cone isolating Gabors are unaffected by luminance noise, indicating that grating motion is mediated via chromatic mechanisms and based on higher-order motion processing. |
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Keywords: | Psychophysics Color Motion Masking S-cones |
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