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Relaxation and phase space singularities in time series of human magnetoencephalograms as indicator of photosensitive epilepsy

Yulmetyev, R. M. and Hänggi, P. and Yulmetyeva, D.G. and Shimojo, S. and Khusaenova, E. V. and Watanabe, K. and Bhattacharya, J. (2007) Relaxation and phase space singularities in time series of human magnetoencephalograms as indicator of photosensitive epilepsy. Physica A, 383 (2). pp. 443-454. ISSN 0378-4371. doi:10.1016/j.physa.2007.04.046.

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To analyze the crucial role of fluctuation and relaxation effects for the function of the human brain we studied some statistical quantifiers that support the information characteristics of neuromagnetic brain responses (magnetoencephalogram, MEG). The signals to a flickering stimulus of different color combinations have been obtained from a group of control subjects which is then contrasted with those of a patient suffering photosensitive epilepsy (PSE). We found that the existence of the specific stratification of the phase clouds and the concomitant relaxation singularities of the corresponding nonequilibrium dynamics of the chaotic behavior of the signals in separate areas in a patient provide likely indicators for the zones which are responsible for the appearance of PSE.

Item Type:Article
Related URLs:
URLURL TypeDescription
Shimojo, S.0000-0002-1290-5232
Bhattacharya, J.0000-0003-3443-9049
Additional Information:© 2007 Elsevier B.V. Received 26 February 2007; revised 26 March 2007. Available online 27 April 2007. This work was supported by the Grants of RFBR N 05-02-16639a, Ministry of Education and Science of Russian Federation N (R.Y., D.Y., and E.K.) and JST. Shimojo ERATO project (J.B., K.W., and S.S.).
Funding AgencyGrant Number
Ministry of Education and Science of Russian FederationRFBR N 05-02-16639a
Japan Science and Technology AgencyUNSPECIFIED
Subject Keywords:discrete non-Markov stochastic processes; relaxation and phase space singularities; magnetoencephalograms; human brain; photosensitive epilepsy
Issue or Number:2
Classification Code:PACS numbers: 05. 45. Tp; 87. 19. La; 89. 75
Record Number:CaltechAUTHORS:20090419-184744066
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14015
Deposited By: Joy Painter
Deposited On:21 Apr 2009 22:53
Last Modified:08 Nov 2021 22:42

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