NEGRO AMERICAN PERCEPTION OF THE IRRADIATION ILLUSION.
D000293:Adolescent; D001741:Black or African American; D044383:Black People; D002648:Child; D006801:Humans; D007088:Illusions; D010465:Perception; D014481:United States; D014796:Visual Perception
ADOLESCENCE; CHILD; ILLUSIONS; NEGROES; UNITED STATES; VISUAL PERCEPTION