[esnr] abst eeg global changes

  • From: JefCrotty@xxxxxx
  • To: esnr@xxxxxxxxxxxxx
  • Date: Sat, 16 Oct 2004 16:25:07 EDT

IEEE Trans Neural Syst Rehabil Eng. 2003 Jun;11(2):133-7.
EEG changes accompanying learned regulation of 12-Hz EEG activity.

Delorme A, Makeig S.

Swartz Center for Computational Neuroscience, Institute for Neural 
Computation, University of California at San Diego, La Jolla 92093-0961, USA. 

We analyzed 15 sessions of 64-channel electroencephalographic (EEG) data 
recorded from a highly trained subject during sessions in which he attempted to 
regulate power at 12 Hz over his left- and right-central scalp to control the 
altitude of a cursor moving toward target boxes placed at the top-, middle-, or 
bottom-right of a computer screen. We used infomax independent component 
analysis (ICA) to decompose 64-channel EEG data from trials in which the 
successfully up- or down-regulated the measured EEG signals. Applying 
time-frequency analysis to the time courses of activity of several of the 
resulting 64 
independent EEG components revealed that successful regulation of the measured 
activity was accompanied by extensive, asymmetrical changes in power and 
coherence, at both nearby and distant frequencies, in several parts of cortex. 
more complete understanding of these phenomena could help to explain the nature 
and locus of learned regulation of EEG rhythms and might also suggest ways to 
further optimize the performance of brain-computer interfaces.

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