Effects of incentive on rotary pursuit performance by normals and retardates.
D000124:Achievement; D002648:Child; D003937:Diagnosis, Differential; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis*; D007361:Intelligence Tests; D007721:Knowledge of Results, Psychological; D009042:Motivation; D009048:Motor Skills; D011214:Practice, Psychological; D014796:Visual Perception