Population and unit synchrony of fast rhythms in expiratory recurrent laryngeal discharges.
In a decerebrate, vagotomized, gallamine-paralyzed cat that had a prominent bilaterally coherent fast rhythm (50 Hz) in expiratory (E) recurrent laryngeal (RL) nerve discharges, recordings were taken of the firing of nine RL E fibers. This rhythm (called E high-frequency oscillation or EHFO) was seen as a sharp peak in all unit autospectra, all unit-nerve coherence spectra (value range 0.39-0. 91), and all unit-unit coherence spectra (value range 0.27-0.85). In addition, 8/9 units had a sharp autospectral peak in a lower frequency range (19-35 Hz) called E medium-frequency oscillation (EMFO), but there was no coherence at this frequency between signal pairs (unit-unit, unit-nerve, nerve-nerve). The MFOs are specific for each unit and are considered to arise from asynchronous inputs and membrane properties. The HFOs are considered to arise from widespread network interactions that produce a common (correlated) rhythm in virtually all neurons of the RL E network. These phenomena suggest the use of the RL E network as a model system for analyzing rhythmic neural interactions.
Department of Physiology and Biophysics, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
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Huang
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Cohen
D000200:Action Potentials / Q000502:physiology; D000818:Animals; D002415:Cats; D003655:Decerebrate State; D004594:Electrophysiology; D007823:Laryngeal Nerves / Q000166:cytology* / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology*; D010507:Periodicity; D014628:Vagotomy