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Related Experiment Videos

Is there an evoked vascular response?

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

    Science (New York, N.Y.)
    |June 22, 1984
    PubMed
    Summary
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    Brain event-related potentials strengthen with stimulation during diastolic pulse phases. This suggests a neurally mediated vascular response anticipating metabolic needs, measurable in real time.

    Area of Science:

    • Neuroscience
    • Cerebrovascular Physiology

    Background:

    • Event-related potentials (ERPs) are neural signals.
    • Cerebral pulse pressure waves influence brain activity.

    Purpose of the Study:

    • To investigate the relationship between cerebral pulse pressure waves and brain event-related potentials.
    • To explore the temporal dynamics of evoked vascular responses in the brain.

    Main Methods:

    • Measuring averaged evoked vascular responses using bioimpedance techniques from the brain and arm.
    • Synchronizing stimulation with diastolic and systolic phases of the cerebral pulse pressure wave.

    Main Results:

    • Brain event-related potentials were enhanced when stimulation synchronized with diastolic, not systolic, phases.

    Related Experiment Videos

  • Changes in brain blood volume occurred 150-250 ms after diastolic-synchronized stimulation.
  • The observed time course challenges conventional metabolic activity models.

    • Conclusions:

    • Evoked vascular responses may be neurally mediated, anticipating metabolic demand.
    • This phenomenon offers potential for real-time measurement of neurovascular coupling.