Jan 8, 2016

Random recurrent networks near criticality capture the broadband power distribution of human ECoG dynamics

BioRxiv : the Preprint Server for Biology
Rishidev ChaudhuriXiao-Jing Wang

Abstract

The power spectrum of brain electric field potential recordings is dominated by an arrhythmic broadband signal but a mechanistic account of its underlying neural network dynamics is lacking. Here we show how the broadband power spectrum of field potential recordings can be explained by a simple random network of nodes near criticality. Such a recurrent network produces activity with a combination of a fast and a slow autocorrelation time constant, with the fast mode corresponding to local dynamics and the slow mode resulting from recurrent excitatory connections across the network. These modes are combined to produce a power spectrum similar to that observed in human intracranial EEG (i.e., electrocorticography, ECoG) recordings. Moreover, such a network naturally converts input correlations across nodes into temporal autocorrelation of the network activity. Consequently, increased independence between nodes results in a reduction in low-frequency power, which offers a possible explanation for observed changes in ECoG power spectra during task performance. Lastly, changes in network coupling produce changes in network activity power spectra reminiscent of those seen in human ECoG recordings across different arousal states. This...Continue Reading

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Mentioned in this Paper

Biological Neural Networks
Brain Diseases
Electroencephalography
Electrocochleography
Brain
Arousal
Anti-Arrhythmia Agents
Neural Network Simulation
Intracranial
Structure

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