Fig. 6.

Comparison of Granger causality (expressed as normalized values) and coherence for six representative electrode pairs. The top row is two electrode pairs that have a decrease in delta coherence during anesthesia (FC5 to F8 and Fp1 to O1); the middle row is an increase in delta coherence (C3 to Cz and Fp2 to T8); and the bottom row is an increase in alpha coherence (F7 to F8 and Fp2 to FC1). Color indicates whether the measurements were during the responsive period (blue; before loss of responsiveness, after regain of responsiveness), or during the unresponsive period (orange/red; between loss of responsiveness and regain of responsiveness). “+” symbols are the loss of behavioral response transition; “o” symbols are the regain of behavioral response transition.