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Related Experiment Videos

Transient cardio-respiratory responses to visually induced tilt illusions.

S J Wood1, C D Ramsdell, T J Mullen

  • 1Bobby R. Alford Department of Otorhinolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, TX 77058-3696, USA. sjwood@bcm.tmc.edu

Brain Research Bulletin
|October 18, 2000
PubMed
Summary

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Visual cues can trigger cardiovascular responses similar to standing up, even without actual body movement. This suggests visual-vestibular input aids in adjusting to postural changes.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Human Physiology

Background:

  • The baroreflex is the primary regulator of orthostatic cardio-respiratory responses.
  • Vestibular cues also play a role in these responses in humans and animals.
  • Previous research suggests a visually mediated response to illusory tilt in some individuals.

Purpose of the Study:

  • To investigate the contribution of visual-vestibular input to cardiovascular adjustments during postural changes.
  • To examine cardio-respiratory responses to visually induced illusory tilt.
  • To compare responses to illusory visual tilt with real passive head-up tilt.

Main Methods:

  • 16 healthy subjects were monitored in a supine position.
  • Cardiovascular parameters (blood pressure, heart rate, respiration rate, lung volume) were recorded.
Keywords:
NASA Center JSCNASA Discipline NeuroscienceNon-NASA Center

Related Experiment Videos

  • Visual stimuli included static and dynamic scenes presented via an ultra-wide dome projection system.
  • Responses were compared to real passive whole body tilt.

    • Main Results:

    • Several subjects exhibited transient decreases in mean blood pressure and changes in pulse pressure in response to illusory tilt.
    • These physiological changes mimicked initial responses to passive head-up tilt.
    • Visual stimuli elicited subjective perceptions of tilt and/or rotation, but correlations with physiological responses were not significant.

    Conclusions:

    • Visual-vestibular input appears to contribute to the initial cardiovascular adjustments to postural changes in humans.
    • Illusory visual tilt can evoke transient physiological responses similar to those seen during actual postural shifts.
    • Individual variability exists in the response to visual-vestibular stimulation.