Margaret R. Burchinal, Frances A. Campbell, Donna M. Bryant, Barbara H. Wasik, Craig T. Ramey, Early Intervention and Mediating Processes in Cognitive Performance of Children of Low-Income African American Families, Child Development, Vol. 68, No. 5 (Oct., 1997), pp. 935-954
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Burchinal et al. (1997) studied this question.