STDP induced rhythmogenesis in the gamma band

by Mr. Gabi Socolovsky

Dept. Of Physics And Zlotowski Center For Neuroscience, Ben-Gurion University Of The Negev
at Biological and soft-matter physics

Thu, 21 May 2020, 12:00
ZOOM Meeting ID: 953 7405 3387 Password: 742020


Oscillatory activity in the gamma band frequencies (30-100Hz) has been observed in a wide range of animal species ranging from insects to humans. These oscillations have been reported in relation with: sensory stimulation, attention selection, working memory and more. Various experimental and theoretical studies investigated the rhythmic activity in the gamma band. Mainly, the theoretical efforts have been focused on the rhythmic activity of the neurons, assuming network connectivity satisfies certain fine-tuning conditions required to generate gamma oscillations. Here we investigate whether spike timing dependent plasticity (STDP) can provide the underlying mechanism for tuning synaptic connectivity to generate rhythmic activity in the gamma band, and if so, under what conditions?
We address these questions in a modeling study. We investigate STDP dynamics in the framework of a network of excitatory and inhibitory neuronal populations that has been suggested to underlie the generation of gamma. We derive STDP dynamics equations for the synaptic weights dynamics in the limit of slow learning. This is facilitated by using an existing reduces rate model approximation to the network dynamics. Relying on this approximation we investigate what types of STDP rules will drive the system to exhibit gamma oscillations, and how the parameters that characterize the plasticity rule govern the rhythmic activity.

Support: This research was supported by the Israel Science Foundation (ISF) grant number 300/16.

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Created on 05-05-2020 by Granek, Rony (rgranek)
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