Focal-point dependency in inversion perception among Negro, urban Caucasian and rural Caucasian children.
D001741:Black or African American; D000704:Analysis of Variance; D002675:Child, Preschool; D003467:Cultural Deprivation; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D012424:Rural Population; D014505:Urban Population; D044465:White People