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Infant-directed speech becomes less redundant as infants grow: Implications for language learning
Shira Tal1, Eitan Grossman2, Inbal Arnon3
1Department of Linguistics and English Language, University of Edinburgh, United Kingdom; Department of Cognitive Sciences, The Hebrew University of Jerusalem, Israel.
Cognition
|May 29, 2024
Summary
Parents use less redundant speech with older infants, indicating adjusted language based on proficiency. This developmental decrease in redundancy affects both word and multi-word sequence repetition.
Area of Science:
- Developmental Psychology
- Linguistics
- Information Theory
Background:
- Infant-directed speech (IDS) is often characterized as repetitive.
- Communicative efficiency and language development theories predict varying redundancy based on interlocutor age.
Purpose of the Study:
- To quantify redundancy in infant-directed speech using entropy rate.
- To investigate if speech redundancy decreases as perceived interlocutor proficiency increases with age.
Main Methods:
- Utilized two developmental corpora of infant-directed speech.
- Applied entropy rate, an information-theoretic measure, to quantify speech redundancy.
- Compared entropy rates across speech samples from infants of different ages.
Main Results:
- Found a significant decrease in speech redundancy when parents spoke to older infants compared to younger infants.
- Observed that reduced redundancy was due to less lexical repetition and fewer repetitions of multi-word sequences.
- Demonstrated an effect of perceived interlocutor proficiency on the redundancy of speech.
Conclusions:
- Parental speech becomes less redundant as infants mature, reflecting an adaptation to their developing language proficiency.
- The decrease in redundancy highlights the role of both single words and larger sequences in early language acquisition.
- Entropy rate offers a novel, holistic measure for assessing redundancy in infant-directed speech.
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