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Basic optokinetic-ocular reflex pathways in the frog.

S L Cochran, N Dieringer, W Precht

    The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
    |January 1, 1984
    PubMed
    Summary
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    Frogs

    Area of Science:

    • Neuroscience
    • Comparative Biology
    • Visual System Research

    Background:

    • The frog's midbrain contains nuclei processing visual information.
    • Optokinetic stimulation reveals direction-selective neurons in the basal optic nucleus.
    • Pretectal cells and oculomotor neurons exhibit specific sensitivities to visual pattern movement.

    Purpose of the Study:

    • To investigate the optokinetic responses of frog visual neurons.
    • To explore the connectivity between sensory and motor nuclei in the frog visual system.
    • To elucidate the neural pathways mediating optokinetic reflexes.

    Main Methods:

    • Recording neuronal responses to optokinetic stimulation.
    • Antidromic identification of oculomotor and abducens motoneurons.

    Related Experiment Videos

  • Horseradish peroxidase tracing to map neural connections.

    • Main Results:

    • Basal optic nucleus neurons show directional selectivity for vertical and horizontal (nasotemporal) movement.
    • Pretectal cells are sensitive to temporal-nasal but not nasotemporal movement.
    • Oculomotor and abducens motoneurons share optokinetic sensitivities with sensory nuclei.
    • Evidence suggests a direct, likely disynaptic, connection between the pretectum and abducens nucleus.

    Conclusions:

    • A three-neuronal retino-ocular reflex pathway is proposed for optokinetic slow-phase behavior in frogs.
    • Direct pretectal-abducens connections may initiate and accelerate eye movements.
    • Indirect pathways might be involved in maintaining eye position during visual-motor tasks.