Class and ethnic differences in the responsiveness of preschool children to cognitive demands.
D000124:Achievement; D001724:Birth Weight; D002652:Child Behavior; D002675:Child, Preschool; D003071:Cognition; D005006:Ethnicity; D005191:Family Characteristics; D005260:Female; D006801:Humans; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D008568:Memory; D009048:Motor Skills; D010988:Play and Playthings; D011247:Pregnancy; D011248:Pregnancy Complications; D012923:Social Class; D014705:Verbal Behavior