title: A follow-up developmental study of hypothesis behavior among mentally retarded and nonretarded children.
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003210:Concept Formation; D004193:Discrimination Learning; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis*; D007360:Intelligence; D008297:Male