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Coding process in human stretch reflex analysed by phase-locked spikes.

S Homma, Y Nakajima

    Neuroscience Letters
    |January 1, 1979
    PubMed
    Summary
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    This study analyzed motor unit responses in the soleus muscle to Achilles tendon taps. The primary correlation kernel, representing alpha-motoneuron excitatory postsynaptic potential time-to-peak, was found to be 8.3 milliseconds.

    Area of Science:

    • Neuroscience
    • Human Physiology
    • Motor Control

    Background:

    • Understanding the relationship between afferent nerve stimulation and motor unit response is crucial in motor control research.
    • The soleus muscle and Achilles tendon provide a model system for studying spinal reflexes.
    • Previous research has explored the characteristics of motor unit firing patterns.

    Purpose of the Study:

    • To investigate the temporal relationship between mechanical stimulation of the Achilles tendon and the discharge probability of single soleus motor units.
    • To quantify the characteristics of the motor unit response using cross-correlogram analysis.
    • To interpret the findings in terms of the underlying neural circuitry, specifically the excitatory postsynaptic potential (EPSP) of alpha-motoneurons.

    Main Methods:

    Related Experiment Videos

    • Mechanical triangular pulsatory waves were applied to the Achilles tendon at stimulus intervals ranging from 10 to 100 Hz.
    • Single motor unit spikes were recorded from the soleus muscle.
    • Cross-correlogram analysis was employed to analyze the discharge probability of motor unit spikes in relation to the tendon taps.

    Main Results:

    • Summation of cross-correlograms revealed a prominent primary correlation kernel.
    • The mean width of this primary correlation kernel, termed the correlation time, was measured at 8.3 ± 2.5 milliseconds.
    • This correlation time indicates the temporal dynamics of the neural response to the mechanical stimulus.

    Conclusions:

    • The correlation time of 8.3 ms is interpreted as reflecting the time-to-peak of the excitatory postsynaptic potential (EPSP) in alpha-motoneurons.
    • This finding provides quantitative insights into the synaptic integration and firing properties of motoneurons in response to muscle spindle afferent input.
    • The study highlights the utility of cross-correlation analysis in characterizing the input-output relationship of motor pathways.