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

Bojak, I. ORCID: https://orcid.org/0000-0003-1765-3502 and Liley, D. T. J. (2007) Self-organized 40Hz synchronization in a physiological theory of EEG. Neurocomputing, 70 (10-12). pp. 2085-2090. ISSN 0925-2312 doi: 10.1016/j.neucom.2006.10.087

Abstract/Summary

We present evidence that large-scale spatial coherence of 40 Hz oscillations can emerge dynamically in a cortical mean field theory. The simulated synchronization time scale is about 150 ms, 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.