On May 17, 1954, the U.S. Supreme Court's Brown v. Board of Education decision cited the Clarks' doll-study research on the psychological harms of segregation.
On May 17, 1954, the U.S. Supreme Court issued its landmark ruling in Brown v. Board of Education of Topeka, declaring racial segregation in public schools unconstitutional. Central to the Court's reasoning about the psychological harm inflicted on Black children by segregation was the doll-study research conducted by Mamie Phipps Clark and her husband Kenneth Clark.
The Clarks' studies, which began with Mamie's own 1939 master's thesis research and expanded throughout the 1940s, involved presenting Black children with dolls identical except for skin color and asking them to identify which dolls were "good" or "bad," and which most resembled themselves. The results consistently showed that many Black children internalized negative racial biases, often preferring white dolls and associating negative traits with dolls that resembled themselves—evidence of the psychological damage inflicted by a segregated society.
This research was submitted as part of the NAACP Legal Defense Fund's case, with Kenneth Clark serving as an expert witness. The Supreme Court's opinion explicitly referenced social science research, including the Clarks' work, in footnote 11, to support its conclusion that segregation generated feelings of inferiority that could affect children's motivation to learn.
This citation marked one of the first times social science research directly informed a major Supreme Court civil rights decision, cementing Mamie Phipps Clark's scientific legacy as foundational to the American civil rights movement and demonstrating the real-world power of psychological research to reshape law and society.