“…These investigators concluded that the deficits identified in the MHI sample w r ere not caused by head injury but were a manifestation of the poorer premorbid functioning attributed to that group (Brown, Chadwick, Shaffer, Rutter, & Traub, 1981;Chadwick, Rutter, Brown, Shaffer, & Traub, 1981;Chadwick, Rutter, Shaffer, & Shrout, 1981;Rutter, Chadwick, Shaffer, & Brown, 1980). Some studies of head injury, however, support the contention that milder forms of insult that occur during childhood or adolescence can affect the ability to learn new material, solve unfamiliar problems, and abstract information (Adams, 1990;Boll, 1983;Boll & Barth, 1981;Conboy, Barth, & Boll, 1986;Gulbrandsen, 1984;Hannay & Levin, 1988;Klonoff, Low, & Clark, 1977;Klonoff & Paris, 1974;Levin & Eisenberg, 1979a, 1979bSegalowitz & Brown, 1991). Deficits in information processing, including attention and reaction time, are among the most salient effects of MHI Gentilini et al, 1985;Gronwall, 1989;Gronwall & Wrightson, 1981).…”