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Related Experiment Videos

The vestibulo-ocular reflex in newborn rats.

I S Curthoys

    Acta Oto-Laryngologica
    |May 1, 1979
    PubMed
    Summary

    Vestibular functioning develops early in rats, with the vestibulo-ocular reflex evident before eye opening and full canal maturation. Threshold currents for this reflex decrease as the rats grow.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Ophthalmology

    Background:

    • The development of sensory systems is crucial for an organism's survival and interaction with its environment.
    • Understanding the maturation of the vestibular system is key to comprehending balance and eye movement control.

    Purpose of the Study:

    • To investigate the developmental timeline of vestibular functioning in rats.
    • To characterize the maturation of the vestibulo-ocular reflex (VOR) in relation to age and anatomical development.

    Main Methods:

    • Testing the vestibulo-ocular reflex (VOR) in rats across different age groups.
    • Utilizing high-frequency electrical stimulation of the vestibular nerve.
    • Measuring evoked conjugate eye movements and determining threshold currents.

    Main Results:

    • The VOR was observed in newborn rats prior to eye opening (around day 15).
    • Vestibular functioning was present before the semi-circular canals reached adult size (around day 22).
    • A decrease in threshold currents required for VOR elicitation was noted during postnatal growth.

    Conclusions:

    • The vestibulo-ocular reflex (VOR) demonstrates functional development very early in postnatal life in rats.
    • Vestibular nerve stimulation can elicit eye movements before significant anatomical maturation of the vestibular system.
    • Maturation of the VOR involves a reduction in the required stimulation intensity over time.

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