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Oscillations in endogenous inputs to neurons affect excitability and signal processing
Marjorie A Parkis1, Jack L Feldman, Dean M Robinson
1Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois 60637, USA.
Summary
Neuronal oscillations precisely time action potentials in breathing control. Filtering these oscillations reduces action potential precision and number, impacting motor output efficiency.
Area of Science:
- Neuroscience
- Physiology
Background:
- Neuronal synchrony and oscillations are crucial for brain information processing.
- Breathing, a vital motor behavior, is controlled by rhythmic neuronal output.
Purpose of the Study:
- To investigate the role of oscillations in controlling neuronal output during breathing.
- To determine how oscillations impact phrenic motoneuron (PMN) firing patterns.
Main Methods:
- Used an in vitro neonatal rat preparation generating respiratory motor output.
- Recorded and injected endogenous inspiratory currents into PMNs.
- Evaluated oscillation impact by filtering currents before injection.
Main Results:
- Unfiltered oscillations precisely timed >90% of action potentials.
- Filtering oscillations (<50 Hz) reduced action potential timing precision.
- Filtering decreased action potential number by ~35% and altered firing frequency responses to phenylephrine.
Conclusions:
- Oscillations are essential for precise action potential timing in breathing control.
- Oscillations enhance synaptic drive efficiency and optimize motoneuron firing frequencies.
- These findings highlight the functional significance of neuronal oscillations in motor behavior.