Examination of the variables in the factor analyses showed that there are three main “modes” or time frames of duration for phase shift duration. Figure 3 shows phase shift duration in the x-axis and the percentage of subjects in the study showing specific phase shift durations on the y-axis. The x, y, and z directions all showed essentially the same phase shift duration modes. The three duration modes or “quanta” for phase shift using the resultant vector for both the eyes closed and eyes open conditions demonstrated that discrete durations are present and that there is no or minimal overlap between modes. It can be seen in Figure 3 that the subjects clustered in three different and discrete time frames or modes. Mode 1 showed a peak phase shift duration of approximately 25 ms, Mode 2 was approximately 50 ms and Mode 3 was approximately 65 ms. There was little overlap between phase duration modes and all variables exhibited only one of the three modes which demonstrates discrete time frames of phase shift duration in specific groups of Brodmann areas that comprise the DMN.
