Propagation of EEG Activity in the Beta and Gamma Band during Movement Imagery in Humans

J. Ginter Jr.; K. J. Blinowska; M. Kamiński; P. J. Durka; G. Pfurtscheller; C. Neuper

doi:10.1055/s-0038-1633932

Methods of Information in Medicine, Table of Contents

Methods Inf Med 2005; 44(01): 106-113
DOI: 10.1055/s-0038-1633932

Original Article

Schattauer GmbH

Propagation of EEG Activity in the Beta and Gamma Band during Movement Imagery in Humans

J. Ginter Jr.

¹Laboratory of Medical Physics, Warsaw University, Poland

,

K. J. Blinowska

¹Laboratory of Medical Physics, Warsaw University, Poland

,

M. Kamiński

¹Laboratory of Medical Physics, Warsaw University, Poland

,

P. J. Durka

¹Laboratory of Medical Physics, Warsaw University, Poland

,

G. Pfurtscheller

²Department of Medical Informatics, Institute of Biomedical Engineering, Technical University Graz, Graz, Austria

,

C. Neuper

³Institute of Biomedical Engineering, Graz University of Technology, Graz, Austria

› Author Affiliations

Abstract

Summary

Objectives: The objective of the paper was the determination of electrical brain activity propagation in sensorimotor areas during hand movement imagery.

Methods: Right-hand and left-hand movement imagination was studied in three subjects. The 10-channel Multivariate Autoregressive Model (MVAR) was fitted to EEG signals recorded from subsets of electrodes overlying central and related brain areas. By means of the Short-time Directed Transfer Function (SDTF) the propagation of brain activity as a function of frequency and time was found.

Results: During imagery the relation between propagations in gamma and beta bands changed significantly for electrodes overlying sensorimotor areas, namely the increase in gamma was accompanied by the decrease in the beta band.

Conclusions: The hypothesis was put forward that these kinds of changes in flow of electrical brain activity are connected with the specific information processing.

Keywords

Short-time Directed Transfer Function (SDTF) - motor imagery - beta rhythm - gamma rhythm - EEG activity propagation

Full Text

References

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