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Related Experiment Videos

Weak sensory stimuli induce a phase sensitive bradycardia.

J R Jennings1, M W van der Molen, R J Somsen

  • 1University of Pittsburgh, PA.

Psychophysiology
|January 1, 1991
PubMed
Summary

Significant perceptual stimuli cause heart rate deceleration that varies with cardiac cycle timing. This phase-dependent deceleration was confirmed, even with demanding stimuli and improved methods.

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Area of Science:

  • Psychophysiology
  • Cardiovascular Regulation

Background:

  • Previous research suggests perceptual stimuli can alter heart rate.
  • The timing of stimuli within the cardiac cycle may influence heart rate responses.
  • Factors like stimulus intensity and task demands could modulate these effects.

Purpose of the Study:

  • To investigate if perceptual stimuli induce cardiac cycle-timed heart rate deceleration.
  • To examine how stimulus intensity, response type, and respiratory phase affect this phenomenon.
  • To confirm phase-sensitive deceleration with demanding sensory stimuli.

Main Methods:

  • Twenty-four male volunteers performed visual discrimination or speeded response tasks.
  • Stimuli were presented at varying times after the electrocardiogram R-wave (0-500 ms).

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  • Stimulus intensity was set at 63% or 90% detection levels; respiratory phase was monitored.

    • Main Results:

    • A phase-dependent heart rate deceleration was observed.
    • Deceleration was greater for stimuli presented in the early to mid-cardiac cycle.
    • This effect was more pronounced during the expiratory phase of respiration.
    • Stimulus intensity and perceptual/motor set did not alter the phase-sensitive deceleration.

    Conclusions:

    • Phase-sensitive deceleration of heart rate by perceptual stimuli is a robust phenomenon.
    • The cardiac cycle timing of stimulus presentation significantly influences heart rate response amplitude.
    • Respiratory phase plays a role in modulating this cardiac response.