title: Classification behaviors in third and sixth grade lower and middle socio-economic status school children.
mesh_terms: D002648:Child; D002657:Child Development; D003071:Cognition; D003118:Color Perception; D003210:Concept Formation; D004522:Educational Status; D005556:Form Perception; D006801:Humans; D007361:Intelligence Tests; D011582:Psychological Theory; D012923:Social Class; D013334:Students; D013781:Texas; D044465:White People