title: Effects of prolonged practice on duration of spiral aftereffect: an ideographic study.
abstract: The effects of prolonged practice on the duration of the spiral aftereffect were investigated; 3,000 trials over 30 days with 5 levels of ambient illumination were randomly presented to a single subject. Scores gradually decreased until a plateau was reached during the last 13 days. A large decrement during the last 5 days was attributed to a decision process component. An early difference in performance at different illumination levels was largely eliminated by the last 5 days.
mesh_terms: D003657:Decision Making; D005260:Female; D005366:Figural Aftereffect; D006801:Humans; D007088:Illusions; D008029:Lighting; D009039:Motion Perception; D009903:Optical Illusions; D011214:Practice, Psychological; D012399:Rotation; D013997:Time Factors