Central neural mechanisms for detecting second-order motion.
Single-unit neurophysiology and human psychophysics have begun to reveal distinct neural mechanisms for processing visual stimuli defined by differences in contrast or texture (second-order motion) rather than by luminance (first-order motion). This processing begins in early visual cortical areas, with subsequent extrastriate specialization, and may provide a basis for form-cue invariant analyses of image structure, such as figure-ground segregation and detection of illusory contours.
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McGill Vision Research Unit, Department of Ophthalmology, McGill University, 687 Pine Ave W, H4-14, Montreal, Quebec, Canada H3A 1A1,. curtis@astra.vision.mcgill.ca
D000818:Animals; D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation; D015398:Signal Transduction / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology*