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Synaptic control of an endogenous pacemaker network

J L Ayers, A I Selverston

    Journal De Physiologie
    |January 1, 1977
    PubMed
    Summary
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    This study reveals how synaptic inputs coordinate pacemaker neurons in the lobster pyloric system. These neurons can be entrained by external stimuli, demonstrating their sensitivity to rhythmic synaptic drive.

    Area of Science:

    • Neuroscience
    • Systems Neuroscience
    • Computational Neuroscience

    Background:

    • The pyloric motor system in crustaceans is driven by endogenous pacemaker neurons.
    • Understanding synaptic integration is crucial for deciphering neural circuit function.

    Purpose of the Study:

    • To analyze the coordinating effects of excitatory and inhibitory postsynaptic potentials (EPSPs and IPSPs) on pacemaker neuron discharge.
    • To investigate the entrainment properties of the pyloric oscillator to synaptic input.

    Main Methods:

    • Experiments were conducted on isolated spiny lobster nervous systems.
    • Analysis of phase response curves to monosynaptic EPSPs and IPSPs.
    • Repetitive stimulation of synaptic inputs near the endogenous frequency.

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    Main Results:

    • The pyloric oscillator exhibits periodically varying sensitivity to synaptic drive, a characteristic necessary for entrainment.
    • Pacemaker neuron discharge was successfully entrained to cyclic synaptic stimulation.
    • Distinct phase relationships were observed between pyloric discharge and the two types of synaptic input, correlating with phase response curves.

    Conclusions:

    • The periodic sensitivity of pacemaker neurons to synaptic input arises from interactions between synaptically induced and endogenous currents.
    • These findings elucidate mechanisms of neural circuit coordination and entrainment in a well-characterized motor system.