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Phase relations between carotid pressure and ongoing electrocortical activity.

B B Walker, J M Walker

    International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
    |August 1, 1983
    PubMed
    Summary
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    This study reveals that brain activity (EEG) rhythms are synchronized with heartbeats. Specifically, electrocortical rhythms during systolic and diastolic pressure differ, suggesting a link between cardiovascular changes and brain activity.

    Area of Science:

    • Psychophysiology
    • Neuroscience
    • Cardiovascular Research

    Background:

    • The link between cardiovascular system changes and behavior is debated in psychophysiology.
    • Few studies explore the relationship between cardiac events and electrocortical activity (EEG) in humans.

    Purpose of the Study:

    • To investigate the relationship between cardiac events and electrocortical activity in resting human subjects.
    • To compare EEG activity during systolic and diastolic pressure phases.

    Main Methods:

    • Recorded carotid artery pressure waves from resting subjects.
    • Analyzed phase, amplitude, and frequency of electrocortical (EEG) activity.
    • Compared EEG patterns during systolic versus diastolic pressure.

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    Main Results:

    • Rhythmic EEG oscillations, especially in the alpha range, were time-locked to the carotid pressure wave.
    • EEG activity during systolic and diastolic pressure phases was significantly out of phase.
    • EEG frequencies were slower during systolic pressure compared to diastolic pressure.

    Conclusions:

    • Cardiovascular events are demonstrably linked to electrocortical rhythms.
    • The cardiovascular system may influence behavior via its impact on brain rhythms.
    • This research provides a foundation for understanding psychophysiological interactions.