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Category: Project

Description: The current longitudinal study will examine the acoustic properties of infant-directed speech (IDS) to Norwegian infants from 6 to 18 months of age, as compared to adult-directed speech (ADS; thereafter ‘register’). Parents have been recorded at five timepoints (infants age: 6, 9, 12, 15, 18 months, respectively), in the lab, while reading a picture book designed for the purpose of the study, once to their infant (IDS) and once to an experimenter (ADS). The parent could be either the infants’ mother or father (the main caregiver at the given time). Eight acoustic variables will be generated from the audio recordings in both registers: pitch, pitch range, articulation rate, vowel duration, vowel space areas [based on a) the three corner vowels, and b) all border vowels], vowel variability and vowel distinctiveness.