Spatiotemporal patterns of beta desynchronization and gamma synchronization in corticographic data during self-paced
G Pfurtscheller1, B Graimann, J E Huggins
1Department of Medical Informatics, Institute of Biomedical Engineering, University of Technology Graz, Inffeldgasse 16a/II, A-8010 Graz, Austria. pfurtscheller@tugraz.at
Objective:
To study the spatiotemporal pattern of event-related desynchronization (ERD) and event-related synchronization (ERS) in electrocorticographic (ECoG) data with closely spaced electrodes.
Methods:
Four patients with epilepsy performed self-paced hand movements. The ERD/ERS was quantified and displayed in the form of time-frequency maps.
Results:
In all subjects, a significant beta ERD with embedded gamma ERS was found.
Conclusions:
Self-paced movement is accompanied not only by a relatively widespread mu and beta ERD, but also by a more focused gamma ERS in the 60-90 Hz frequency band.
