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Related Experiment Videos

A laterality effect in isometric and isotonic labial tracking

H M Sussman, J R Westbury

    Journal of Speech and Hearing Research
    |September 1, 1978
    PubMed
    Summary

    The left hemisphere likely dominates sensorimotor control of lip movements, as evidenced by better performance when auditory feedback is routed to the right ear. This suggests a specialized left-hemisphere mechanism for integrating sensory and motor information.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Auditory Processing

    Background:

    • Hemispheric specialization is crucial for sensorimotor control.
    • The role of the left hemisphere in lip articulation control requires further investigation.

    Purpose of the Study:

    • To investigate hemispheric dominance for sensorimotor control of lip activity.
    • To determine if the left hemisphere is dominant for lip control using auditory feedback.

    Main Methods:

    • A pursuit auditory tracking task was employed.
    • Subjects performed isometric and isotonic lip and hand control tasks.
    • Auditory feedback (cursor tone) was presented to either the right or left ear.

    Main Results:

    • Tracking performance was significantly better when the lip-controlled cursor tone was presented to the right ear (p < 0.05).
    • A cursor/right-ear advantage was observed in 58% of subjects for isometric tracking and 71% for isotonic tracking.
    • This right-ear advantage was consistent across different time intervals within trials.

    Conclusions:

    • Findings suggest a left hemisphere dominance for sensorimotor control of lip activity.
    • A specialized left hemisphere mechanism may integrate auditory feedback with kinesthetic information from articulators.

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