Sharp edge artifacts and spurious coupling in EEG frequency comodulation measures.
Recent electroencephalogram (EEG), electrocorticogram (ECoG), and local field potential (LFP) observations suggest that distinct frequency bands interact. Numerous measures have been proposed to analyze such interactions, including the amplitude envelope modulation of high frequency activity by the phase or signal of low frequency activity. In this short communication, we describe how abrupt increases or decreases in voltage data may produce spurious coupling in these measures and suggest techniques to detect these effects.
Kramer
Mark A
MA
Department of Mathematics and Statistics & Center for BioDynamics, Boston University, Boston, MA 02215, USA. mak@bu.edu
Tort
Adriano B L
AB
Kopell
Nancy J
NJ
D000513:Alpha Rhythm; D016477:Artifacts; D003198:Computer Simulation; D003627:Data Interpretation, Statistical; D004569:Electroencephalography / Q000706:statistics & numerical data*; D004594:Electrophysiology; D005071:Evoked Potentials / Q000502:physiology; D012984:Software; D013826:Theta Rhythm