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• W2031570501 abstract "Quantitative analysis of human electroencephalogram (EEG) is a valuable method for evaluating psychopharmacological agents. Although the effects of different drug classes on EEG spectra are already known, interactions between brain locations remain unclear. In this work, cross mutual information function and appropriate surrogate data were applied to assess linear and nonlinear couplings between EEG signals. The main goal was to evaluate the pharmacological effects of alprazolam on brain connectivity during wakefulness in healthy volunteers using a cross-over, placebo-controlled design. Eighty-five pairs of EEG leads were selected for the analysis, and connectivity was evaluated inside anterior, central, and posterior zones of the scalp. Connectivity between these zones and interhemispheric connectivity were also measured. Results showed that alprazolam induced significant changes in EEG connectivity in terms of information transfer in comparison with placebo. Trends were opposite depending on the statistical characteristics: decreases in linear connectivity and increases in nonlinear couplings. These effects were generally spread over the entire scalp. Linear changes were negatively correlated, and nonlinear changes were positively correlated with drug plasma concentrations; the latter showed higher correlation coefficients. The use of both linear and nonlinear approaches revealed the importance of assessing changes in EEG connectivity as this can provide interesting information about psychopharmacological effects." @default.
• W2031570501 created "2016-06-24" @default.
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• W2031570501 date "2009-11-05" @default.
• W2031570501 modified "2023-10-09" @default.
• W2031570501 title "Drug effect on EEG connectivity assessed by linear and nonlinear couplings" @default.
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• W2031570501 doi "https://doi.org/10.1002/hbm.20881" @default.
• W2031570501 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6870649" @default.
• W2031570501 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19894215" @default.
• W2031570501 hasPublicationYear "2009" @default.
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