Detecting structured repetition in child-surrounding speech: Evidence from maximally diverse languages

Area of Science:

• Developmental linguistics
• Computational linguistics
• Language acquisition

Background:

• Repetition in caretaker speech aids language learning in children.
• Variation sets, clusters of partial repetitions, provide crucial context for grammatical development.
• Previous research indicates variation set rates decrease with child age.

Purpose of the Study:

• To investigate the generalizability of developmental trends in repetition across diverse languages.
• To compare repetition at word and morpheme levels, considering typological variations.
• To introduce and analyze a new measure of speech redundancy and compare child-directed with adult-directed speech.

Main Methods:

• Analyzed a diverse corpus of child-directed and adult-directed speech across multiple languages.
• Utilized algorithms to automatically extract variation sets.
• Calculated redundancy as a measure of speech repetitiveness relative to random chance.

Main Results:

• Developmental trends in repetition varied, with some languages showing increases over time.
• Estimated variation set frequencies were often at or below random baselines.
• Adult-directed speech was less redundant but sometimes more repetitive than child-directed speech.

Conclusions:

• Developmental patterns of repetition are not universal and depend on language and developmental indices.
• The prevalence and function of variation sets require further investigation, especially in comparison to random speech.
• Differences in redundancy and repetition between child-directed and adult-directed speech offer insights into communicative strategies.