- Poster presentation
- Open Access
Emergent phenomena in human EEG: a bifurcation theory approach
© Frascoli et al; licensee BioMed Central Ltd. 2009
- Published: 13 July 2009
- Bifurcation Diagram
- Bifurcation Parameter
- Neural Population
- Emergent Phenomenon
- Dynamical Requirement
A recently proposed mesoscopic mean-field theory of mammalian cortex electro-rhythmogenesis describes the salient features of electrical activity in the cerebral macrocolumn, with the use of inhibitory and excitatory neuronal populations . Numerical solutions to the defining non-linear equations have revealed two interesting emergent phenomena: i) the appearance of large-scale spatial coherent 40 Hz oscillations in the model cortex, which has shown to be experimentally related to cognitive activity , and ii) a surge in spectral EEG power – when the brain is subject to general anesthetics – as a function of their concentration , a clinically established effect known as the "biphasic" response. Given that quasi-linear approximations have been unable to capture the dynamical mechanism that trigger these phenomena, a bifurcation analysis  of physiologically relevant parameter sets was performed.
- Liley DTJ, Cadusch PJ, Dafilis MP: A spatially continuous mean field theory of electrocortical activity. Network: Comput Neural Syst. 2002, 13: 67-113. 10.1088/0954-898X/13/1/303.View ArticleGoogle Scholar
- Bojak I, Liley DTJ: Self-organized 40 hz synchronization in a physiological theory of EEG. Neurocomp. 2007, 70: 2085-2090. 10.1016/j.neucom.2006.10.087.View ArticleGoogle Scholar
- Bojak I, Liley DTJ: Modeling the effects of anesthesia on the electroencephalogram. Phys Rev E. 2005, 71: 041902(1–22).Google Scholar
- Kuznetsov YA: Elements of applied bifurcation theory. 2004, New York, Springer-Verlag, 3View ArticleGoogle Scholar
This article is published under license to BioMed Central Ltd.