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A universal of speech timing: Intonation units form low-frequency rhythms
Maya Inbar1,2,3, Eitan Grossman1, Ayelet N Landau2,3,4
1Department of Linguistics, The Hebrew University of Jerusalem, Mount Scopus, Jerusalem 9190501, Israel.
Summary
Intonation units (IUs), building blocks of speech, occur at a consistent low rate across 48 languages. This universal speech pattern is independent of syllable rate and shows minimal variation with age or sex.
Area of Science:
- Linguistics
- Phonetics
- Psycholinguistics
Background:
- Intonation units (IUs) are proposed as universal speech building blocks.
- IUs play roles in pacing ideas and facilitating turn-taking in discourse.
- Previous research suggests IUs are present across diverse languages.
Purpose of the Study:
- To investigate the rate of intonation units (IUs) across a wide range of languages.
- To determine if IU rate varies significantly with factors like sex or age.
- To explore the relationship between IU rate and syllable rate across languages.
Main Methods:
- Analyzed natural speech recordings from 48 languages spanning all continents.
- Employed an analytic annotation method to identify and quantify IUs.
- Measured speech rate at the syllable level for comparison with IU rate.
Main Results:
- Observed a consistently low rate of IUs across the sampled languages, peaking at 0.6 Hz.
- Found minimal variation in IU rate across different sexes and age groups.
- Determined that IU rate is weakly correlated with syllable rate, and cross-linguistic variation in IU rate is not explained by syllable rate variation.
Conclusions:
- Intonation unit rate is a stable feature of human speech across diverse languages and populations.
- The rate of IUs is largely independent of the rate of syllables, suggesting distinct underlying mechanisms.
- This study supports the universality of intonation units as fundamental components of spoken language.
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