title: A study of some symbolic processes in young children.
mesh_terms: D002675:Child, Preschool; D003210:Concept Formation; D006801:Humans; D007223:Infant; D007804:Language Development; D007806:Language Disorders / Q000175:diagnosis / Q000628:therapy; D012923:Social Class; D013561:Symbolism; D014796:Visual Perception