Mapping of event-related desynchronization and type of derivation.

Event-related desynchronization (ERD) is a term describing alpha band amplitude changes in response to an event (stimulus presentation, self-paced movement, etc.). ERD mapping is a brain-imaging technique used to display the topographical pattern and time course of alpha power changes. Multi-lead EEG data referred to one ear were recorded during voluntary finger movements. From these data, transverse bipolar, source and common average reference derivations and the laplacian operator were calculated, and ERD maps are computed. The ERD is enhanced and best localized with the laplacian operator method, or with source derivations. ERD maps with ear reference required cautious interpretation.

[1]  B. Hjorth.  An on-line transformation of EEG scalp potentials into orthogonal source derivations. , 1975, Electroencephalography and clinical neurophysiology.

[2]  G. Pfurtscheller,et al.  Event-related cortical desynchronization detected by power measurements of scalp EEG. , 1977, Electroencephalography and clinical neurophysiology.

[3]  P E Roland,et al.  Cortical organization of voluntary behavior in man. , 1985, Human neurobiology.

[4]  G Pfurtscheller,et al.  Frequency dependence of the transmission of the EEG from cortex to scalp. , 1975, Electroencephalography and clinical neurophysiology.

[5]  R Coppola,et al.  A new system for gray-level surface distribution maps of electrical activity. , 1982, Electroencephalography and clinical neurophysiology.

[6]  W. van Winsum,et al.  Event-related desynchronization and P300. , 1987, Psychophysiology.

[7]  G. Chatrian,et al.  The blocking of the rolandic wicket rhythm and some central changes related to movement. , 1959, Electroencephalography and clinical neurophysiology.

[8]  G. Pfurtscheller,et al.  Evaluation of event-related desynchronization (ERD) preceding and following voluntary self-paced movement. , 1979, Electroencephalography and clinical neurophysiology.