“…Tasks in these investigations require the children to make judgments about isolated sentences structured to violate specific linguistic rules. These data indicate that by four years of age, children can accurately judge sentences that present violations of meaning but are less successful on syntactic acceptability judgments (Gleitman, Gleitman, & Shipley, 1972;James & Miller, 1973;deVilliers & deVilliers, 1974;Bohannon, 1975;Leonard, Bolders, & Curtis, 1977;Hakes, 1980). Variations in acceptability judgments across types of sentence violations were also found in investigations of sentence acceptability judgments by elementary school-aged, language-disordered children (Liles, Schulman, & Bartlett, 1977;Kahmi & Koenig, 1985).…”