Magnitude estimation of visual velocity.
D000054:Acceleration; D004056:Differential Threshold; D005133:Eye Movements; D005403:Fixation, Ocular; D006801:Humans; D007088:Illusions; D007600:Judgment; D007721:Knowledge of Results, Psychological; D009039:Motion Perception; D010775:Photic Stimulation; D011214:Practice, Psychological; D014785:Vision, Ocular