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The effects of the age of acquisition (AoA) of words were examined in the clinical treatment of 10 preschool children with phonological delays. Using a single-subject multiple-baseline experimental design, children were enrolled in one of four conditions that varied the AoA of the treated words (early vs. late acquired) relative to their corresponding word frequency (high vs. low frequency). Phonological generalization to treated and untreated sounds in error served as the dependent variable.doi:10.1017/s0142716411000294 pmid:22408279 pmcid:PMC3293394 fatcat:nentkyjxgnauhavn4jknndupgi