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  • Title: S-cone contributions to linear and non-linear motion processing.
    Author: Michna ML, Yoshizawa T, Mullen KT.
    Journal: Vision Res; 2007 Apr; 47(8):1042-54. PubMed ID: 17343890.
    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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