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Oculomotor function at low temperature: antarctic versus temperate fish.

J C Montgomery, J A Macdonald

    The Journal of Experimental Biology
    |July 1, 1985
    PubMed
    Summary
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    Antarctic fish exhibit temperature-compensated eye movements due to their peripheral oculomotor system. This system

    Area of Science:

    • Neuroscience
    • Comparative Physiology
    • Ophthalmology

    Background:

    • The peripheral oculomotor system is modeled as a first-order linear system.
    • Key parameters include characteristic frequency and 'd.c.' gain.
    • These parameters influence eye movement control.

    Purpose of the Study:

    • To investigate temperature compensation in the peripheral oculomotor system of fish.
    • To compare Antarctic and temperate fish species.
    • To understand the mechanisms behind rapid eye movement in Antarctic fish.

    Main Methods:

    • Stimulating the abducens nerve with sinusoidally modulated pulse trains.
    • Recording eye movements.
    • Determining characteristic frequency and 'd.c.' gain.

    Related Experiment Videos

  • Comparing parameters across different fish species and temperatures.

    • Main Results:

    • Characteristic frequency is temperature-compensated in Antarctic fish.
    • This compensation explains rapid eye movement in these species.
    • 'd.c.' gain is inversely related to temperature.

    Conclusions:

    • The peripheral oculomotor system shows significant temperature compensation in Antarctic fish.
    • This adaptation is crucial for maintaining eye movement function in cold environments.
    • Inverse temperature-dependent gain provides automatic compensation for potential neural and sensory reductions at low temperatures.