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Pre- to post-treatment change in the anterior and posterior language lateralization indices for the AAC and the usual care groups. LI values < −0.1 indicates right-lateralization and LI > 0.1 indicate left-lateralization; whereas values between −0.1 < LI ≤ 0.1 represent bilateral, or symmetric language distribution (Dietz et al., 2016; Szaflarski et al., 2014; Szaflarski et al., 2006; Wilke & Lidzba, 2007).
