Related Experiment Video
Updated: Jul 2, 2026
Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
Published on: June 27, 2013
Visualization of significant ERD/ERS patterns in multichannel EEG and ECoG data
B Graimann1, J E Huggins, S P Levine
1Department of Medical Informatics, Institute for Biomedical Engineering, Technical University Graz, Inffeldgasse 16a/II, A-8010 Graz, Austria. graimann@dpmi.tu-graz.ac.at
Objectives:
Analysis of event-related desynchronization (ERD) and event-related synchronization (ERS) often requires the investigation of diverse frequency bands. Such analysis can be difficult, especially when using multichannel data. Therefore, an effective method for the visualization of event-related changes in oscillatory brain activity is required.
Methods:
A bootstrap-based method is presented which gives time-frequency maps showing only significant changes of ERD or ERS in predetermined frequency bands.
Results:
Examples from an electroencephalographic study and an electrocorticographic study are shown. The results demonstrate how easily reactive channels and their spatio-temporal and frequency-specific characteristics can be identified by means of this method.
Conclusions:
The proposed method is a simple but effective way to visualize significant ERD/ERS patterns.
