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Related Experiment Videos

Vestibular-visual conflict sickness in the squirrel monkey.

M Igarashi, H Isago, T O-Uchi

    Acta Oto-Laryngologica
    |March 1, 1983
    PubMed
    Summary
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    Conflicting visual and vestibular stimuli can induce vomiting in squirrel monkeys. Neither stimulus alone was sufficient to cause emesis, highlighting the importance of sensory mismatch in motion sickness.

    Area of Science:

    • Neuroscience
    • Sensory Physiology
    • Vestibular System Research

    Background:

    • Motion sickness is a common condition often triggered by conflicting sensory information.
    • The vestibular system (inner ear balance) and visual system (sight) are crucial for spatial orientation.
    • Understanding the interplay between these systems is key to explaining and mitigating motion sickness.

    Purpose of the Study:

    • To investigate the emetic (vomiting-inducing) potential of combined, mismatched vestibular and visual stimuli.
    • To determine if individual stimuli, when presented alone, can elicit emesis.
    • To establish the role of sensory conflict in inducing nausea and vomiting.

    Main Methods:

    • Squirrel monkeys were exposed to synchronized sinusoidal stimuli in the yaw plane.

    Related Experiment Videos

  • Stimuli included combined vestibular and visual (optokinetic) inputs with directional and phase mismatch.
  • Control trials involved presenting each stimulus individually at the same magnitude.

    • Main Results:

    • Five out of six monkeys exhibited emesis when presented with mismatched combined stimuli.
    • Emesis occurred across multiple trial days for some animals, with an overall incidence of 38.9%.
    • Individual vestibular or visual stimuli did not produce significant emetic effects.

    Conclusions:

    • Sensory conflict between vestibular and visual systems is a potent trigger for emesis.
    • The magnitude of individual stimuli is insufficient to cause vomiting, emphasizing the critical role of mismatch.
    • This research provides insights into the neurophysiological basis of motion sickness.