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Swimming pattern in intact and decerebrated stingrays.

M H Droge, R B Leonard

    Journal of Neurophysiology
    |July 1, 1983
    PubMed
    Summary
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    Decerebration does not alter the fundamental timing or phase coupling of stingray swimming movements. This suggests the central nervous system

    Area of Science:

    • Comparative Physiology
    • Neuroscience
    • Locomotion

    Background:

    • Stingrays utilize a distinctive rostral-to-caudal fin wave for locomotion.
    • Understanding the neural control of this complex movement is crucial.
    • Electromyography (EMG) is a key technique for analyzing muscle activation patterns.

    Purpose of the Study:

    • To compare the timing relationships of stingray swimming before and after decerebration.
    • To investigate the role of the central nervous system in maintaining locomotor rhythm.
    • To determine if decerebration affects the phase coupling of fin movements.

    Main Methods:

    • Electromyograms (EMGs) were recorded from stingrays, both freely swimming and restrained.
    • Restrained preparations were validated for accurately reflecting swimming dynamics.

    Related Experiment Videos

  • Locomotor rhythm and intersegmental delays were analyzed in intact and decerebrate animals.

    • Main Results:

    • Intersegmental delay and EMG burst duration showed linear relationships with swim cycle period.
    • Decerebration did not alter the linear relationship between intersegmental delay and segmental separation.
    • Constant phase coupling was observed in stingray swimming, unaffected by decerebration.

    Conclusions:

    • The fundamental timing and phase coupling of stingray swimming are maintained after decerebration.
    • This suggests that the core locomotor rhythm is generated by a neural circuit that does not require direct input from the forebrain.
    • Different muscle fiber types are recruited for varying swimming speeds, indicating specialized muscle activation.