
Application to biomedical signals 121
FIGURE 4.9: EEG transmission in awake state eyes closed obtained by means of
different methods.
of DTF. On the other hand making the transformation to the source space involves
calculations, which can change the delicate balance in phase dependencies between
channels. Determination of MVAR model coefficients (and hence DTF) is based on
the correlation matrix between signals. The transformation changes this correlation
matrix in such a way that the correlations may be disturbed. It is recommended to
use as input to DTF the signals referenced to “neutral” electrode, e.g., “linked ears,”
“nose,” etc. Before fitting the ...