68. Saudino, K.J., & Plomin, R. (1997). Cognitive and temperamental mediators of genetic contributions to the home environment during infancy. Merrill-Palmer Quarterly, 43, 1-23.

Data from the CAP comparing adoptive and nonadoptive siblings suggest substantial genetic variance on Caldwell and Bradley's Home Observation for Measurement of the Environment (HOME). The Bayley Mental Development Index (MDI) can account for approximately one quarter of the genetic contribution to the HOME at 24 months of age. The additional genetic contribution of temperament, as assessed by tester ratings on Bayley's Infant Behavior Record (IBR) was examined. In a trivariate genetic analysis of the HOME, MDI, and IBR Task Orientation (TO), TO explained the remaining genetic variance on the HOME not explained by the MDI. Thus, during infancy, genetic contributions to the HOME appear to be mediated by cognitive factors, but even more strongly by temperament factors