Self-organized 40Hz synchronization in a physiological theory of EEG

  • Authors:

  • I. Bojak;D. T. J. Liley

  • Affiliations:

  • Centre for Intelligent Systems and Complex Processes, LSS H31, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia;Centre for Intelligent Systems and Complex Processes, LSS H31, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia

  • Venue:
  • Neurocomputing
  • Year:
  • 2007

Quantified Score

Hi-index 0.01

Visualization

Abstract

We present evidence that large-scale spatial coherence of 40Hz oscillations can emerge dynamically in a cortical mean field theory. The simulated synchronization time scale is about 150ms, which compares well with experimental data on large-scale integration during cognitive tasks. The same model has previously provided consistent descriptions of the human EEG at rest, with tranquilizers, under anesthesia, and during anesthetic-induced epileptic seizures. The emergence of coherent gamma band activity is brought about by changing just one physiological parameter until cortex becomes marginally unstable for a small range of wavelengths. This suggests for future study a model of dynamic computation at the edge of cortical stability.