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Abstract
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.