The goal of this research is to study the speech strategies of adults' interactions with 4-7-year-old children. The participants are "mother-child" dyads with typically developing (TD, = 40) children, children with autism spectrum disorders (ASDs, = 20), Down syndrome (DS, = 10), and "experimenter-orphan" pairs ( = 20). Spectrographic, linguistic, phonetic, and perceptual analyses ( = 465 listeners) of children's speech and mothers' speech (MS) are executed.
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