title: Development of time concepts in normal and retarded children.
mesh_terms: D000293:Adolescent; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003210:Concept Formation; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D007361:Intelligence Tests; D013998:Time Perception