Measurement of the electroencephalogram (EEG) coherence in group meditation

Electrical activity in the human body was investigated using EEG measurement while subjects remained with eyes open, eyes closed and in a meditation state. Careful analysis of the EEG data showed the presence of coherence in dual EEG channels and this measure was used to quantify the meditation state. The performed measurements showed high coherence around 10 Hz in individual meditating subjects. When these measurements extended to group meditation of two subjects, it was observed that coherence spectra spread significantly to other frequencies.