The unintelligibility of speech to children

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Abstract
Words artificially isolated from twelve parents' speech to their children (aged 1; 10–3; 0) were significantly less intelligible to adult listeners than words originally spoken to an adult. This effect holds for randomly sampled words and, to a lesser extent, for matched pairs. While parents did not adjust the clarity of word tokens to the linguistic naiveté of the child listeners, they did adjust intelligibility inversely to the observed predictability of the sampled words in their sentence contexts, and words to children proved more redundant in this sense. The relationship of these findings to other work on the clarity of motherese is examined and the implications for the study of children's speech perception outlined.