title: FOUR ABILITY-FACTOR HYPOTHESES AT THREE PRELITERATE LEVELS IN NORMAL AND RETARDED CHILDREN.
mesh_terms: D002648:Child; D005163:Factor Analysis, Statistical; D006801:Humans; D008607:Intellectual Disability; D007360:Intelligence; D009048:Motor Skills; D011581:Psychological Tests; D014796:Visual Perception; D014825:Vocabulary
keywords: CHILD; FACTOR ANALYSIS, STATISTICAL; INTELLIGENCE; MENTAL RETARDATION; MOTOR SKILLS; PSYCHOLOGICAL TESTS; VISUAL PERCEPTION; VOCABULARY