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    Adding load to the lower lip did not alter basic lip movements but increased variability in lip coordination, especially at faster speech rates. This suggests a tightly coupled lip system, similar to limb control dynamics.

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    Area of Science:

    • Speech Motor Control
    • Biomechanics
    • Linguistics

    Background:

    • Understanding lip movement coordination is crucial for speech production.
    • Limb loading studies suggest predictable patterns in motor control.
    • Investigating lip loading can reveal insights into speech motor dynamics.

    Purpose of the Study:

    • To examine how lower lip loading affects upper and lower lip movements.
    • To assess the coordination dynamics between the lips under load.
    • To test predictions from limb control theories in the context of speech.

    Main Methods:

    • Electromagnetic midsagittal articulography was used to record lip movements.
    • Four conditions were tested: baseline, with a carrier device, with added weight, and post-removal.
    • Participants repeated nonwords at two speaking rates, with kinematic and phase variability analyzed.

    Main Results:

    • Kinematic measures of lip movement showed no systematic changes with added load.
    • Phase deviations between lips remained unaffected by lower lip loading.
    • Phase variability significantly increased under lower lip load, particularly at faster speech rates.

    Conclusions:

    • Lower lip loading impacts lip coordination variability, mirroring effects seen in limb loading.
    • The findings support theories of tight coupling between the lips in speech production.
    • Coordination dynamics principles from limb control appear applicable to speech motor systems.