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Clin Neurophysiol. 1999 Nov;110(11):1842-57.

Event-related EEG/MEG synchronization and desynchronization: basic principles.

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  • 1Department of Medical Informatics, Institute of Biomedical Engineering, Technical University Graz, Austria.


An internally or externally paced event results not only in the generation of an event-related potential (ERP) but also in a change in the ongoing EEG/MEG in form of an event-related desynchronization (ERD) or event-related synchronization (ERS). The ERP on the one side and the ERD/ERS on the other side are different responses of neuronal structures in the brain. While the former is phase-locked, the latter is not phase-locked to the event. The most important difference between both phenomena is that the ERD/ERS is highly frequency band-specific, whereby either the same or different locations on the scalp can display ERD and ERS simultaneously. Quantification of ERD/ERS in time and space is demonstrated on data from a number of movement experiments.

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