title: Discrimination learning in retarded and nonretarded children as a function of task difficulty and social reinforcement.
mesh_terms: D000293:Adolescent; D002648:Child; D002674:Child, Institutionalized; D003071:Cognition; D003210:Concept Formation; D004193:Discrimination Learning; D005260:Female; D005556:Form Perception; D006760:Hospitalization; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D008297:Male; D009042:Motivation; D012056:Reinforcement, Social; D012718:Set, Psychology; D013647:Task Performance and Analysis