title: Rate of stereotyped body rocking of severe retardates as a function of frustration of goal-directed behavior.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005639:Frustration; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D009043:Motor Activity; D011336:Probability; D012054:Reinforcement, Psychology; D012201:Reward; D013997:Time Factors