Caffeine-Induced Reductions in the Resting-State fMRI Global Signal Reflect Increases in EEG Vigilance Measures

Keywords

alpha amplitude anti applied artifact artifacts attempt averaging ballistic band bands began behind bold bottom brain caffeine calculating channel channels closed connectivity considered consisted containing contaminated controversial coordinate coordinates correlated correlation cortex courses create created daily decreases default degree delta derivatives derived detection deviation displayed divided dividing dose electrical enhances every examined exhibit eyes females finding frequency functional global glover gradient healthy identify induced intake involves known linear males maps matrix measure measures middle minimizing minute minutes mode motion negative network neural noise nuisance often ones overall overlap panel percent physiological positive post posterior power prior processed processing produce products pronounced recorded reduces reduction reductions reflect regression regressors related removal remove removed representative residual resolution resting sampling scanner seed segments series session short simultaneous slices software space spectra spectrogram spectrum sphere square step subject subjects subtracting suggests summary system task temporal term terms theta transform transforming vigilance vision volumes window wise