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Related Experiment Videos

Blink reflex in hemiplegia.

H Dehen, J C Willer, N Bathien

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Central facial palsy from hemispheral damage alters the blink reflex bilaterally. Electrophysiological studies reveal decreased blink reflex amplitude on the affected side and facilitation on the unaffected side.

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    Area of Science:

    • Neuroscience
    • Electrophysiology
    • Clinical Neurology

    Background:

    • The blink reflex involves R1 and R2 responses, with known habituation patterns in healthy individuals.
    • Central facial palsy, often due to unilateral hemispheral damage, affects facial motor control.
    • Understanding blink reflex alterations provides insights into central nervous system modulation.

    Purpose of the Study:

    • To investigate the electrophysiological changes in the blink reflex in patients with central facial palsy.
    • To compare blink reflex responses between normal subjects and those with unilateral hemispheral lesions.
    • To explore the cortical modulatory influences on brain-stem nuclei through blink reflex analysis.

    Main Methods:

    • Electrophysiological recordings of the blink reflex were performed.

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  • Stimulation rates varied to assess habituation of R1 and R2 responses.
  • Blink reflex responses were analyzed in 20 normal subjects and 28 patients with central facial palsy.

    • Main Results:

    • Patients with unilateral hemispheral lesions exhibited bilateral changes in blink reflex responses.
    • Decreased amplitude was observed on the hemiplegic side, with facilitation on the contralateral side.
    • No latency changes were noted, but habituation patterns differed significantly between affected and unaffected sides compared to controls.

    Conclusions:

    • Unilateral hemispheral lesions induce bilateral, asymmetrical changes in the blink reflex.
    • These findings support the concept of cortical modulation of brain-stem pathways.
    • The study suggests a tactile origin for both components of the blink reflex.