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Related Experiment Videos

Rapid auditory evoked vascular response in man.

J P O'Halloran, C A Sandman, R Isenhart

    Experimental Neurology
    |September 1, 1985
    PubMed
    Summary

    Auditory tones evoke a rapid vascular response in humans, detectable in the fingertip, forearm, brain, and eye. This neural-mediated response suggests novel cerebral vasculature responsiveness to sound.

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    Area of Science:

    • Neuroscience
    • Cardiovascular Physiology
    • Bioengineering

    Background:

    • Plethysmography measures volume changes, often reflecting blood flow.
    • Auditory stimuli can influence physiological responses beyond hearing.
    • Cerebral vasculature regulation is crucial for brain function.

    Purpose of the Study:

    • To investigate the cerebrovascular response to auditory stimulation.
    • To determine the timing and characteristics of evoked vascular changes.
    • To explore potential neural mediation of vascular responses.

    Main Methods:

    • Recording plethysmographic signals from fingertip, forearm, cerebral cortex, and ophthalmic artery.
    • Presenting brief auditory tones during systolic and diastolic phases of the cardiac cycle.
    • Applying data processing techniques similar to evoked potential studies to derive averaged waveforms.

    Main Results:

    • A polyphasic volumetric response was observed as early as 150 ms after auditory tone onset in some subjects.
    • Similar waveform morphology was noted across all four recorded body regions.
    • The rapid onset of the response supports neural mediation.

    Conclusions:

    • An evoked vascular response to auditory stimuli exists in humans.
    • This response, particularly in the brain, indicates a previously unrecognized responsiveness of cerebral vasculature to auditory input.
    • The findings suggest a transient vascular smooth muscle flexure mediated by neural pathways.

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