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Nonlinear Input-Output Functions of Motoneurons
Marc D Binder1, Randall K Powers1, C J Heckman2
1Department of Physiology & Biophysics, University of Washington School of Medicine, Seattle, Washington.
Physiology (Bethesda, Md.)
|December 5, 2019
Summary
Motoneurons control all movements, but their complex behavior, due to persistent inward currents (PICs), challenges motor control modeling. Understanding these nonlinearities is key to advancing our knowledge of motor commands.
Area of Science:
- Neuroscience
- Motor Control
- Computational Neuroscience
Background:
- Motoneurons are the final output pathway for all motor commands.
- Their input-output properties are crucial for generating movement.
- Nonlinear behaviors in motoneurons present a significant challenge to understanding motor control.
Purpose of the Study:
- To review the role of persistent inward currents (PICs) in motoneuronal discharge.
- To examine how PICs contribute to the nonlinear properties of motoneurons.
- To discuss the implications of these nonlinearities for motor control modeling.
Main Methods:
- Literature review focusing on motoneuronal physiology.
- Analysis of voltage-gated Na+ and Ca2+ channel contributions to PICs.
- Discussion of computational modeling challenges.
Main Results:
- Persistent inward currents (PICs) significantly influence motoneuronal firing patterns.
- PICs, mediated by voltage-gated channels, introduce substantial nonlinearities.
- These nonlinearities complicate the accurate prediction of motoneuron output.
Conclusions:
- PICs are a critical factor in motoneuronal function and motor command processing.
- The nonlinear dynamics introduced by PICs impede the development of comprehensive motor control models.
- Further research is needed to effectively incorporate PICs into computational models.