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A statistical technique for measuring synchronism between corticalregions in the EEG during rhythmic stimulation

By A.M.F.L. Miranda de Sa, A.F.C. Infantosi and D.M. Simpson

Abstract

The coherence function has been widely applied in quantifying the degree of synchronism between electroencephalogram (EEG) signals obtained from different brain regions. However, when applied to investigating synchronization resulting from rhythmic stimulation, misleading results can arise from the high correlation of background EEG activity. The authors, thus propose a modified measure, which emphasizes the synchronized stimulus responses and reduces the influence of the spontaneous EEG activity. Critical values for this estimator are derived and tested in Monte Carlo simulations. The effectiveness of the method is illustrated on data recorded from 12 young normal subjects during rhythmic photic stimulation

Topics: RC0321, QC
Year: 2001
OAI identifier: oai:eprints.soton.ac.uk:10859
Provided by: e-Prints Soton

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