A cross-language study of prosodic modifications in mothers' and fathers' speech to preverbal infants

TLDR

This study compares the prosodic modifications in mothers’ and fathers’ speech to preverbal infants across six languages. Standardized procedures were used; five mothers and five fathers per language were recorded in semi‑structured home observations with infants aged 0–12 months and an adult, and speech samples were instrumentally analyzed for seven prosodic parameters. Across languages, parents used higher mean‑f₀, greater f₀ variability, shorter utterances, and longer pauses in infant‑directed speech, with mothers showing a wider f₀ range and American English parents exhibiting the most extreme modifications, indicating common intonation patterns that may regulate infant arousal and language development while also revealing language‑specific differences.

Abstract

ABSTRACT This study compares the prosodie modifications in mothers' and fathers' speech to preverbal infants in French, Italian, German, Japanese, British English, and American English. At every stage of data collection and analysis, standardized procedures were used to enhance the comparability across data sets that is essential for valid cross-language comparison of the prosodie features of parental speech. In each of the six language groups, five mothers and five fathers were recorded in semi-structured home observations while speaking to their infant aged 0; 10–1;2 and to an adult. Speech samples were instrumentally analysed to measure seven prosodic parameters: mean fundamental frequency (f 0 ), f 0 -minimum, f 0 -maximum, f 0 -range, f 0 -variability, utterance duration, and pause duration. Results showed cross-language consistency in the patterns of prosodic modification used in parental speech to infants. Across languages, both mothers and fathers used higher mean-f 0 , f 0 -minimum, and f 0 -maximum, greater f 0 -variability, shorter utterances, and longer pauses in infant-directed speech than in adult-directed speech. Mothers, but not fathers, used a wider f 0 -range in speech to infants. American English parents showed the most extreme prosodic modifications, differing from the other language groups in the extent of intonational exaggeration in Speech to infants. These results reveal common patterns in caretaker's use of intonation across languages, which may function developmentally to regulate infant arousal and attention, to communicate affect, and to facilitate speech perception and language comprehension. In addition to providing evidence for possibly universal prosodic features of speech to infants, these results suggest that language-specific variations are also important, and that the findings of the numerous studies of early language input based on American English are not necessarily generalisable to other cultures.