Interplay between subthreshold potentials and gamma oscillations in Mauthner cells' presynaptic inhibitory interneurons

Neuroscience
F MartiP Faure

Abstract

Oscillations are widely distributed throughout the nervous system. A number of models accounting for their generation and their contribution to the synchronization of the concerned neurons, have been proposed. Most of these schemes involve inhibitory interneurons. Here we studied, in vivo, the firing patterns of interneurons, identified as presynaptic to the goldfish Mauthner (M) cell, and called passive hyperpolarizing potential (PHP) cells. We found that a subset of these interneurons was characterized by the presence of subthreshold oscillations of their membrane potential. Such oscillations near the firing threshold generated action potentials that were phased-locked on the oscillations and consequently, the distributions of time intervals between these spikes were observed at integral multiple values of the oscillation cycles. Two superimposed oscillatory processes have been identified. The amplitude of the first one, "the carrier," was voltage dependent while that of the second, the "modulator," was not. The frequency of the carrier was distributed among four values (140, 100, 71 or 50 Hz), the frequency of the "modulator" was about 50 Hz in almost all the investigated neurons. The demonstration that the 50 Hz oscillation...Continue Reading

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Citations

Mar 20, 2009·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Shennan A WeissDonald S Faber
Mar 30, 2011·Neural Networks : the Official Journal of the International Neural Network Society·Sergiy KochubeyLeonid Savtchenko

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