I am working on the role of intonation in infants’ speech segmentation, using the Head Turn Preference Procedure. We familiarized infants in two intonation conditions (early and medial peaks) and found that German infants (9 months of age) only treat stressed syllables as word onsets when they are high-pitched.

We are now wondering whether our results might be due to a frequency effect of occurrence of different types of pitch accents in infant directed speech. Are medial peaks (H*, metrical prominence and high pitch are aligned) more frequent than early peaks (H+L*, where high pitch precedes the stressed syllable)?

In IDS F0 peaks and emphasized words often fall together and questions are quite often in IDS, which might indicate that rising pitch contours frequently occur in the input (Fernald & Mazzie, 1991). I am looking for corpus or production studies carried out with infant directed speech, but have not found a study investigating this issue yet.

Can anybody help me?

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