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Event-Related Changes of Band Power and Coherence: Methodology and Interpretation

1999; Lippincott Williams & Wilkins; Volume: 16; Issue: 6 Linguagem: Inglês

10.1097/00004691-199911000-00003

1537-1603

G. Pfurtscheller, Colin Andrew,

Functional Brain Connectivity Studies

Summary Event-related calculation of band power changes can be used to quantify event-related desynchronization, event-related synchronization, and event-related coherence (ERCoh). It is shown that in the case of a motor task especially, the ERCoh time course depends on the type of EEG derivation used, whereby referenced EEG data can result in a bilateral coherence increase, although both hemispheres generate independent sensorimotor rhythms. It is further shown that not only Rolandic mu rhythms but also central beta rhythms display a lack of interhemispheric linear phase coupling.