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Abnormal head movements.

M A Gresty, G M Halmagyi

    Journal of Neurology, Neurosurgery, and Psychiatry
    |August 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Abnormal head movements, including tremors and nodding, often occur at frequencies matching the head

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    Area of Science:

    • Neurology
    • Biomechanics
    • Movement Disorders

    Background:

    • Abnormal head movements are observed in various neurological conditions.
    • Objective recording and frequency analysis offer insights into movement characteristics.
    • The head/neck system possesses natural resonant frequencies influencing movement patterns.

    Purpose of the Study:

    • To analyze the frequency content of abnormal head movements.
    • To classify abnormal head movements based on their frequency characteristics.
    • To explore the relationship between head movement frequencies and the head/neck system's resonances.

    Main Methods:

    • Objective recording techniques were employed to capture head movements.
    • Frequency analysis was performed on the recorded movement data.

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  • Comparison of movement frequencies with the natural resonances of the head/neck system.

    • Main Results:

    • Many abnormal head movements (flopping, nodding, tic, chorea, myoclonic jerks, tremors) occur around 2 and 4 Hz.
    • These frequencies align with the fundamental and second harmonic resonances of the head.
    • Two types of head movements were identified in congenital nystagmus: pathological tremors and adaptive nodding.

    Conclusions:

    • The findings provide a basis for classifying abnormal head movements.
    • Movement frequencies correlate with head/neck system resonances, explaining movements in hypotonia.
    • Head tremors may stem from neural control disorders, while nodding can be an adaptive response.