title: The theory of fluid and crystallized general intelligence checked at the 5-6 year-old level.
mesh_terms: D001077:Aptitude Tests; D002648:Child; D002675:Child, Preschool; D003071:Cognition; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D010552:Personality Assessment; D011795:Surveys and Questionnaires