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"look at the Shark": Evaluation of Student Produced Standardized Sentences of Infant- and Foreigner-directed Speech

We evaluated two speech research paradigms by comparing standardized sentences to ‘free speech’ (both produced by students without interaction partner). Samples of infant-(IDS), foreigner- (FDS) and adult-directed speech (ADS) were acoustically analyzed for F0 and hyperarticulation. No difference for hyperarticulation was found between IDS, FDS and ADS, which is in contrast to natural speech and imaginary ‘free speech’. Differences in mean F0 approximated natural speech (IDS significantly higher than ADS and FDS), and represented an improvement compared to imaginary ‘free speech’. The implications of these findings are discussed in the context of experimental speech research.