FIG. 5.

Phase differences during asphyxial stages of representative rat. The distribution of phase differences for the beginning of each asphyxial stage (i.e., beginning 2 sec of AS1–4, respectively) is displayed from −π to π between the left and right frontal leads from 13 to 39 Hz. The mean phase difference is depicted by the angle of the bold black line, and the coherence value is represented by the magnitude of the line. (C) AS3 has a more consistent phase difference compared with (A, B, D) AS1, AS2, and AS4.