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Key mechanisms for setting the input-output gain across the motoneuron pool
Hans Hultborn1, Robert B Brownstone, Tibor I Toth
1Department of Medical Physiology, Panum Institute, University of Copenhagen, Copenhagen DK-2200, Denmark. h.hultborn@mfi.ku.dk
Progress in Brain Research
|December 5, 2003
Summary
Neuromodulators control motoneuron (MN) output by adjusting intrinsic properties. These properties influence synaptic input amplification and the conversion of excitation into firing frequency, impacting motor control.
Area of Science:
- Neuroscience
- Motor Control
- Computational Neuroscience
Background:
- Motoneurons (MNs) are critical for muscle activation and movement.
- Understanding MN input-output functions is key to deciphering motor control.
Purpose of the Study:
- To summarize factors controlling the input-output function of spinal MNs.
- To highlight the role of intrinsic MN properties and neuromodulation.
Main Methods:
- Review of intrinsic MN properties, including persistent inward currents (plateau potentials).
- Analysis of synaptic input transduction into spike frequency.
- Discussion of non-uniform synaptic distribution and recurrent inhibition.
Main Results:
- Neuromodulators significantly influence MN input-output gain.
- Persistent inward currents amplify synaptic inputs at the dendritic level.
- The cell's soma/initial segment transduces net excitation into a firing frequency code.
Conclusions:
- Intrinsic MN properties, modulated by neuromodulators, are crucial for regulating motor output.
- Recurrent inhibition and synaptic distribution may act as variable gain regulators.