Complex spatio-temporal features in meg data

Francesca Sapuppo; Elena Umana; Mattia Frasca; Manuela La Rosa; David Shannahoff-Khalsa; Luigi Fortuna; Maide Bucolo

doi:10.3934/mbe.2006.3.697

Article Contents

2006, Volume 3, Issue 4: 697-716. Doi: 10.3934/mbe.2006.3.697

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Complex spatio-temporal features in meg data

1.
Dipartimento di Ingegneria Elettrica, Elettronica e dei Sistemi, Universita degli Studi di Catania, Viale A. Doria 6, 95125 Catania
2.
Dipartimento di Ingegneria Elettrica, Elettronica e dei Sistemi, Universitá degli Studi di Catania, V.le A, Doria 6, 95125 Catania
3.
Dipartimento di Ingegneria Elettrica Elettronica e dei Sistemi, Facoltà di Ingegneria, Università degli Studi di Catania, viale A. Doria 6, 95125 Catania
4.
PST Group, Corporate R&D, STMicroelectronics, Catania site, Stradale Primosole 50, 95121 Catania
5.
Institute for Nonlinear Science, University of California, San Diego, 9500 Gilman Dr., La Jolla, 92093-0402 CA

Received: February 2006

Revised: June 2006

Published: August 2006

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Abstract

Magnetoencephalography (MEG) brain signals are studied using a method for characterizing complex nonlinear dynamics. This approach uses the value of $d_\infty$ (d-infinite) to characterize the system’s asymptotic chaotic behavior. A novel procedure has been developed to extract this parameter from time series when the system’s structure and laws are unknown. The implementation of the algorithm was proven to be general and computationally efficient. The information characterized by this parameter is furthermore independent and complementary to the signal power since it considers signals normalized with respect to their amplitude. The algorithm implemented here is applied to whole-head 148 channel MEG data during two highly structured yogic breathing meditation techniques. Results are presented for the spatiotemporal distributions of the calculated $d_\infty$ on the MEG channels, and they are compared for the different phases of the yogic protocol. The algorithm was applied to six MEG data sets recorded over a three-month period. This provides the opportunity of verifying the consistency of unique spatio-temporal features found in specific protocol phases and the chance to investigate the potential long term effects of these yogic techniques. Differences among the spatio-temporal patterns related to each phase were found, and they were independent of the power spatio-temporal distributions that are based on conventional analysis. This approach also provides an opportunity to compare both methods and possibly gain complementary information.

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Mathematics Subject Classification: 92D30.

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