“…Perinatal variables such as hypoxia or low birth weight have shown moderate positive correlations with cognitive and motor outcome measures (Smith, Flick, Ferriss, & Sellman, 1972; Werner, Simonian, Bierman, & French, 1967), but recent studies have indicated that a complex network of associations must be considered, since children with similar perinatal insults may have quite different developmental courses (Cohen, Parmelee, Beckwith, & Sigman, 1986; Cohen, Sigman, Parmelee, & Beckwith, 1982; Escalona, 1982). Risk index systems based on combinations of demographic, biological, and environmental variables have been developed for predicting motor, language, and cognitive development (Caputo et al, 1974; Field, Hallock, Ting, Dempsey, Dabiri, & Shuman, 1978; Parmelee, Sigman, Kopp, & Haber, 1975; Ramey, Stedman, Borders-Patterson, & Mengel, 1978; Siegel, 1982; Siegel et al, 1982). Having specified a population of infants as being high-risk, the problem becomes one of early detection and delineation of abnormalities so that early intervention can be arranged.…”