Abstract
Extracortical activity play important role in generation of EEG-signal. Neuronal system in the brain seems to be specially sensitive to sources belonging to the class of functions: [Acos(αt)+Bsin(αt), exp(±αt), Bessel functions]. This representation could be reflect influence of external sources, for example electromagnetic fields, on the brain. In my previous papers I demonstrated the effect of electromagnetic field on the EEG-signal using nonlinear dynamics method - Higuchi’s fractal dimension.
The extracortical input from inhibitory neurons destroys the oscillatory structure of signal generated by extracortical input from excitatory neurons but do not suppresses it completely. The additional component is needed. The long-distance input from excitatory neurons take this role.
The most important parameter in the model is postsynaptic neurotransmitter rate constants. It shows a biphasic effect changes for inhibitory postsynaptic potentials (IPSP) in the EEG-signals during anesthesia. The similar behavior is visible for postsynaptic rate constants but in case of excitatory postsynaptic potential (EPSP) in epileptic EEG-signals. There are two opposed processes occur.
The average excitatory soma potential (he) depend on total number of excitatory and inhibitory intracortical connections. The increase of maximum value of the he occurs for bigger number of excitatory connections. The shape of the curve depend on number of inhibitory connections.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
References
Steyn-Ross ML, Steyn-Ross DA, Sleigh JW, Liley DTJ (1999) Theoretical electroencephalogram stationary spectrum for a white-noise-driven cortex: Evidence for a general anesthetic-induced phase transition. Phys. Rev. E 60: 7299–7311.
Wendling F, Bellanger JJ, Bartolomei F, Chauvel P (2000) Relevance of nonlinear lumped-parameter models in the analysis of depth-EEG epileptic signals. Biol. Cybern. 83: 367–378.
Liley DTJ, Cadusch PJ, Dafilis MP (2002) A spatially continuous mean field theory of electrocortical activity. Computation in Neural Systems 13: 67–113.
Bojak I, Liley DTJ (2005) Modeling the effects of anesthesia on the electroencephalogram. Physical Review E 71: 04190.
Chillemi S, Barbi M, Di Garbo A, Klonowski W, Olejarczyk E, Stepien R (2000) Predictability and Complexity in Human EEG under Magnetic Field, World Scientific Engineering Society, Mathematics and Computers in Biology and Chemistry (WSEAS AMTA-MCBC-MCBE 2000), Montego Bay, Jamaica, December 20–22, 2000.
Klonowski W, Olejarczyk E, Stepien R (2000) Nonlinear Dynamics of EEG-signal Reveals Influence of Magnetic Field on the Brain, Proceedings of Chicago 2000 World Congress on Medical Physics and Biomed. Engineering, 2000, FR-A325-2, on CD only, (abstracts∖4048-52180, short_papers∖4038-52296).
Lipping T, Olejarczyk E, Parts M (2003) Fractal Dimension Analysis of the Effects of Photic and Microwave Stimulation on the Brain Function, World Congress’2003, Sydney, 24–31 August 2003.
Koivuluoma M, Huupponen E, Olejarczyk E, Varri A, Klonowski W (2001) Comparison of Some Linear and Non-linear Methods in the Quantification of NREM Sleep Process Proceedings of 2001 International Symposium on Nonlinear Theory and its Application (NOLTA’2001), Miyagi, Japan, October 2001, pp. 411–414.
Klonowski W, Olejarczyk E, Stepien R, Szelenberger W (2003) New methods of nonlinear and symbolic dynamics in sleep EEG-signal analysis. Modelling and Control in Biomedical Systems 2003, Proceedings of the 5th IFAC Symposium, Melbourne, Australia, 21–23 August 2003, Pergamon, Elsevier.
Olejarczyk E (2003) Analysis of EEG signals using fractal dimension. PhD Thesis, Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, 2003.
Klonowski W, Olejarczyk E, Stepien R (2004) ‘Epileptic seizures’ in economic organism, Physica A 342(3–4): 701–707.
Rudner R, Jalowiecki P, Willand M, Klonowski W, Olejarczyk E, Stepien R, Hagihira S: Fractal dimension (2005) A new EEG-based method of assessing depth of anaesthesia in comparison with BIS during induction and recovery from anaesthesia., Euroanaesthesia 2005, 13th Annual Meeting of European Society of Anaesthesiologists and 27th Annual Meeting of the European Academy of Anaesthesiology, 28–31 May 2005, Vienne.
Klonowski W, Olejarczyk E, Stepien R, Jalowiecki P, Rudner R (2006) Monitoring the Depth of Anaesthesia Using Fractal Complexity Method, in: Complexus Mundi. Emergent Patterns in Nature, M.N. Novak, Ed. World Scientific, 2006, pp. 333–342.
Author information
Authors and Affiliations
Corresponding author
Editor information
Rights and permissions
Copyright information
© 2007 International Federation for Medical and Biological Engineering
About this paper
Cite this paper
Olejarczyk, E. (2007). Modeling the effects of extracortical sources on the EEG-signal. In: Magjarevic, R., Nagel, J.H. (eds) World Congress on Medical Physics and Biomedical Engineering 2006. IFMBE Proceedings, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-36841-0_13
Download citation
DOI: https://doi.org/10.1007/978-3-540-36841-0_13
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-36839-7
Online ISBN: 978-3-540-36841-0
eBook Packages: EngineeringEngineering (R0)