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Related Experiment Videos

Eye movements of stutterers.

M J Doslak, E C Healey, K Riese

    Investigative Ophthalmology & Visual Science
    |September 1, 1986
    PubMed
    Summary

    Researchers studied eye movements in stutterers and found faster, shorter saccades during speech. This suggests altered brainstem activity may contribute to stuttering, offering new insights into speech dysfluency.

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    Area of Science:

    • Neuroscience
    • Speech-Language Pathology
    • Ophthalmology

    Background:

    • Recent research suggests potential differences in brainstem activity in individuals who stutter.
    • Ocular motor control, including saccades and pursuit, may be influenced by speech production mechanisms.

    Purpose of the Study:

    • To investigate ocular motor control, specifically saccades and pursuit, in stutterers compared to non-stutterers during both silent and talking conditions.
    • To determine if speech production elicits ocular motor instabilities or aberrations in stutterers.

    Main Methods:

    • Evaluated saccades and pursuit eye movements in a group of stutterers and a matched control group.
    • Measurements were taken during both silent conditions and while participants were talking.

    Main Results:

    • No significant ocular motor instabilities or aberrations were observed in stutterers during speech.
    • Saccadic latencies and gains were normal in stutterers.
    • Saccades in stutterers exhibited higher peak velocities and shorter durations compared to controls.

    Conclusions:

    • The observed faster, shorter saccades in stutterers are consistent with certain hypotheses regarding the neural basis of speech dysfluency.
    • It is proposed that these saccadic characteristics result from adaptive mechanisms, potentially involving increased excitatory input to brainstem burst cells, to maintain normal saccade gains.

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