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Interlimb coordination during stepping in the cat: an electromyographic analysis.

A W English

    Journal of Neurophysiology
    |January 1, 1979
    PubMed
    Summary
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    Cats exhibit coordinated limb movements during stepping, with preferred patterns of coordination but also significant variability. This suggests flexible neural control mechanisms for locomotion, rather than rigid pathways.

    Area of Science:

    • Neuroscience
    • Locomotion Biomechanics
    • Animal Behavior

    Background:

    • Understanding interlimb coordination is crucial for deciphering the neural control of locomotion.
    • Previous research has identified various patterns in quadrupedal locomotion, but the underlying neural mechanisms and variability remain areas of active investigation.

    Purpose of the Study:

    • To investigate the coordination patterns of the four limbs during overground stepping in intact cats.
    • To analyze the temporal spacing and phase relationships between step cycles of different limb pairs.
    • To explore the variability within and between preferred coordination patterns.

    Main Methods:

    • Simultaneous electromyographic (EMG) recordings from extensor muscles of all four limbs during stepping.
    • Determination of step cycle timing based on EMG activity termination, related to limb-ground contact.

    Related Experiment Videos

  • Calculation of inter-step cycle latencies and phase intervals to quantify interlimb coordination.

    • Main Results:

    • Step cycles of the four limbs are coordinated, often following frequently occurring patterns.
    • Significant variability in phase intervals between limbs suggests flexible interlimb coupling.
    • Hindlimb coordination influences forelimb and diagonal limb coupling predictability, with trotting-like coupling observed during alternate hindlimb coordination.

    Conclusions:

    • Locomotion involves coordinated, yet variable, interlimb movements.
    • Observed coordination patterns and variability suggest facultative capabilities of neural control mechanisms for locomotion.
    • A model of interlimb control should account for both preferred coordination patterns and their associated variability.