Key result
Vowel gaps exceeding 250 ms are linked to absent stress shift via delta brain oscillations.
Why the study?
While stress clash resolution is well documented in lexically stressed languages, non-lexically stressed languages such as Korean or French present more variations in their mechanism of resolution.
Observational
A 250 ms gap between stressed vowels prevents stress shift, corresponding to the minimum interval required by delta brain oscillations to synchronize perception.
The resolution process for stress clash condition, where two consecutive syllables are both (morphologically) stressed, has been well documented for lexically stressed languages such as English or Italian.However, non-lexically stressed languages such as Korean or French present more variations in their mechanism of stress clash resolution.Acoustic analysis examples taken from the spontaneous speech corpus Orfeo show that there is no stress shift of the first stressed syllable when the gap between the phonologically stressed vowels exceeds some 250 ms.This gap depends on the speech rate, a slow rate leading to maintain the morphologically stressed syllable in place, whereas a fast speech rate would reduce the gap between the stressed vowels below 250 ms and will lead to a stress shift.This 250 ms gap value is linked to the minimum interval required by delta brain oscillations to synchronize the perception of stressed syllables.
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Philippe Martin (2022) conducted an observational in Syllabic stress clash. Speech rate was evaluated on Stress shift of the first stressed syllable. A gap between phonologically stressed vowels exceeding 250 ms prevents stress shift, a threshold linked to the minimum interval required by delta brain oscillations to synchronize perception.
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