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• W2274806081 abstract "Local field potential (LFP) recordings from spatially distant cortical circuits reveal episodes of coherent gamma oscillations that are intermittent, and of variable peak frequency and duration. Concurrently, single neuron spiking remains largely irregular and of low rate. The underlying potential mechanisms of this emergent network activity have long been debated. Here we reproduce such intermittent ensemble oscillations in a model network, consisting of excitatory and inhibitory model neurons with the characteristics of regular-spiking (RS) pyramidal neurons, and fast-spiking (FS) and low-threshold spiking (LTS) interneurons. We find that fluctuations in the external inputs trigger reciprocally connected and irregularly spiking RS and FS neurons in episodes of ensemble oscillations, which are terminated by the recruitment of the LTS population with concurrent accumulation of inhibitory conductance in both RS and FS neurons. The model qualitatively reproduces experimentally observed phase drift, oscillation episode duration distributions, variation in the peak frequency, and the concurrent irregular single-neuron spiking at low rate. Furthermore, consistent with previous experimental studies using optogenetic manipulation, periodic activation of FS, but not RS, model neurons causes enhancement of gamma oscillations. In addition, increasing the coupling between two model networks from low to high reveals a transition from independent intermittent oscillations to coherent intermittent oscillations. In conclusion, the model network suggests biologically plausible mechanisms for the generation of episodes of coherent intermittent ensemble oscillations with irregular spiking neurons in cortical circuits." @default.
• W2274806081 created "2016-06-24" @default.
• W2274806081 creator A5023038239 @default.
• W2274806081 creator A5058270393 @default.
• W2274806081 date "2016-01-01" @default.
• W2274806081 modified "2023-09-23" @default.
• W2274806081 title "Coherent and intermittent ensemble oscillations emerge from networks of irregular spiking neurons" @default.
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• W2274806081 doi "https://doi.org/10.1152/jn.00578.2015" @default.
• W2274806081 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4760494" @default.
• W2274806081 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26561602" @default.
• W2274806081 hasPublicationYear "2016" @default.
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