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

1999; Elsevier BV; Volume: 110; Issue: 11 Linguagem: Inglês

10.1016/s1388-2457(99)00141-8

1872-8952

G. Pfurtscheller, F.H. Lopes da Silva,

Neuroscience and Neural Engineering

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.