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Related Experiment Videos

Eye-head coordination during optokinetic stimulation in squirrel monkeys

T Kubo, M Igarashi, D W Jensen

    The Annals of Otology, Rhinology, and Laryngology
    |January 1, 1981
    PubMed
    Summary

    Squirrel monkeys exhibit head deviations during and after optokinetic stimulation, with head nystagmus observed less frequently than in other species. Gaze speed, combining head and eye movements, remained consistent regardless of head fixation.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Vestibular System

    Background:

    • Optokinetic stimulation elicits reflexive eye movements (nystagmus) to stabilize gaze.
    • Head movements often accompany eye movements during vestibular and visual-elicited reflexes.
    • Understanding the interplay between head and eye movements is crucial for vestibular and oculomotor research.

    Purpose of the Study:

    • To investigate head and eye movements in squirrel monkeys during and after optokinetic stimulation.
    • To quantify head deviations and head nystagmus in response to visual stimuli.
    • To analyze the relationship between head and eye movement speeds and determine overall gaze stability.

    Main Methods:

    • Recorded head and eye movements in squirrel monkeys during optokinetic stimulation in the yaw plane.

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  • Analyzed phasic and tonic head deviations relative to ocular quick phases.
  • Quantified head nystagmus and calculated slow-phase head and eye speeds for correlation analysis.

    • Main Results:

    • Head deviations occurred in 94% of recordings during and 75% after stimulation.
    • Head nystagmus was observed in 7 of 9 monkeys, less frequently than in other species.
    • A significant negative correlation (-0.81 to -0.72) was found between slow-phase head and eye speeds.
    • Gaze speed (head + eye) showed no significant difference between free-head and fixed-head conditions.

    Conclusions:

    • Squirrel monkeys display significant head deviations during optokinetic stimulation.
    • Head nystagmus is less prevalent in squirrel monkeys compared to other species studied.
    • Head and eye movements are coupled, contributing to gaze stability, with the combined speed being independent of head fixation.