A follow-up study was then done by scholars Courtney M. Bonam , Vinoadharen Nair Das , Brett R. Coleman , and Phia Salter , who underwent two major social experiments in a conceptual replication of Nelson , Adams , and Salter 's work to further analyse the Marley Hypothesis . Study 1 analysed the responses of 111 European Americans and 43 African Americans , both from a racially diverse university . A similar pattern was seen with the original research were European Americans showed a lower understanding and knowledge of historical events involving racism . Their work emphasizes how a strong racial identity among the European Americans may further implement their denial towards systemic racism . Study 2 shows how people who had learned about the housing policy in U.S. history regarding its impact on African American ghettos had a higher level of acknowledgement towards systemic racism
systemic racism
Institutional racism
Marley hypothesis