TY - GEN AU - Hertzig,M E AU - Birch,H G AU - Thomas,A AU - Mendez,O A TI - Class and ethnic differences in the responsiveness of preschool children to cognitive demands SN - 0037-976X PY - 1968///0501 KW - Achievement KW - Birth Weight KW - Child Behavior KW - Child, Preschool KW - Cognition KW - Ethnicity KW - Family Characteristics KW - Female KW - Humans KW - Intelligence KW - Intelligence Tests KW - Male KW - Memory KW - Motor Skills KW - Play and Playthings KW - Pregnancy KW - Pregnancy Complications KW - Social Class KW - Verbal Behavior N1 - Publication Type: Journal Article ER -