title: Factors influencing velocity coding in the human visual system.
abstract: Differential velocity detection in the fovea was measured over a wide range of velocities (0.25-256 degrees/sec). Differential thresholds were minimum (about 6%) for intermediate velocities (4-32 degrees/sec). Velocity judgements were shown not to depend on duration judgments. The U-shaped curve relating differential velocity detection and velocity was preserved at different background levels and different contrasts. The physiological correlates of these observations are discussed.
mesh_terms: D004056:Differential Threshold; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D009039:Motion Perception / Q000502:physiology*; D010775:Photic Stimulation; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*