title: The relationship between category labeling and sorting with retarded adults.
mesh_terms: D000328:Adult; D000367:Age Factors; D003210:Concept Formation; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D014705:Verbal Behavior; D014796:Visual Perception