Coherence is a measure of connectivity in the brain. It represents the stability or strength of phase coupling in the EEG time series between two electrode sites or two brain regions at a given frequency, expressed as a squared correlation co-efficient (from 0 to 1). Higher coherence values that are closer to 1 show the phase differences have less variability and higher consistency with greater redundancy. It is equal to the number of the connections times the strength of the connections.

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