EEG and Brain Connectivity: A Tutorial - Bio-Medical Instruments, Inc.

Fig. 33 – Example of phase differences of the time series of instantaneous
phase re-set for all 171 combinations of 19 electrodes. Analyses were
produced using the NeuroGuide Lexicor demo from the download at
www.appliedneuroscience.com
40 – Bi-Spectral Cross-Frequency Power Correlations
A common method of evaluating bi-spectral relations is to compute
the cross-frequency power correlation (Linas et al, 2005). The method
involves computing the covariance of power at each frequency bin with
respect to all other frequency bins. An example is shown for the crossfrequency
power correlations from 1 to 50 Hz in wakefulness, drowsiness
and sleep in the same subject as shown in
Fig. 34 – Example of bi-spectrum of cross-frequency power correlations
from 1 to 50 Hz from Cz in the same subject but at different brain states, i.e.,
wakefulness, drowsy and sleep.
41- Cross-Frequency Phase Synchrony or m:n Phase Synchronization