Hauptseite > Publikationsdatenbank > External Drive to Inhibitory Cells Induces Alternating Episodes of High- and Low-Amplitude Oscillations > print

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|a pmc:PMC3431298
024 7 _ |2 DOI
|a 10.1371/journal.pcbi.1002666
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024 7 _ |2 Handle
|a 2128/7585
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041 _ _ |a eng
082 _ _ |a 570
084 _ _ |2 WoS
|a Biochemical Research Methods
084 _ _ |2 WoS
|a Mathematical & Computational Biology
100 1 _ |0 P:(DE-HGF)0
|a Gonzales, O.J.A.
|b 0
245 _ _ |a External Drive to Inhibitory Cells Induces Alternating Episodes of High- and Low-Amplitude Oscillations
260 _ _ |a San Francisco, Calif.
|b Public Library of Science
|c 2012
300 _ _ |a e1002666
336 7 _ |a Journal Article
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440 _ 0 |0 25183
|a PLoS Computational Biology
|v 8
|y 8
500 _ _ |a OJAG was supported by a grant from the EC Marie Curie Research and Training Network (RTN), NEURoVERS-it 019247. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
520 _ _ |a Electrical oscillations in neuronal network activity are ubiquitous in the brain and have been associated with cognition and behavior. Intriguingly, the amplitude of ongoing oscillations, such as measured in EEG recordings, fluctuates irregularly, with episodes of high amplitude alternating with episodes of low amplitude. Despite the widespread occurrence of amplitude fluctuations in many frequency bands and brain regions, the mechanisms by which they are generated are poorly understood. Here, we show that irregular transitions between sub-second episodes of high- and low-amplitude oscillations in the alpha/beta frequency band occur in a generic neuronal network model consisting of interconnected inhibitory and excitatory cells that are externally driven by sustained cholinergic input and trains of action potentials that activate excitatory synapses. In the model, we identify the action potential drive onto inhibitory cells, which represents input from other brain areas and is shown to desynchronize network activity, to be crucial for the emergence of amplitude fluctuations. We show that the duration distributions of high-amplitude episodes in the model match those observed in rat prefrontal cortex for oscillations induced by the cholinergic agonist carbachol. Furthermore, the mean duration of high-amplitude episodes varies in a bell-shaped manner with carbachol concentration, just as in mouse hippocampus. Our results suggest that amplitude fluctuations are a general property of oscillatory neuronal networks that can arise through background input from areas external to the network.
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|a van Elburg, R.A.J.
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