S-cone contributions to linear and non-linear motion processing.
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.
Michna
Magda L
ML
Department of Ophthalmology, McGill Vision Research, McGill University, Montreal, Que., Canada H3A 1A1. magda.michna@mcgill.ca
Yoshizawa
Tatsuya
T
Mullen
Kathy T
KT
D003118:Color Perception / Q000502:physiology; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D010470:Perceptual Masking; D010775:Photic Stimulation; D011601:Psychophysics; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*; D012684:Sensory Thresholds; D014795:Visual Pathways / Q000502:physiology*