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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: Clin Neurophysiol. 2012 Apr 3;123(10):1906–1916. doi: 10.1016/j.clinph.2012.03.001

Fig. 3.

Fig. 3

Illustration of the distance, inclusion and persistence features in the energy and entropy space. (a) Energy and entropy profiles of a 22 min window of an interictal epoch (black symbols) and a preictal epoch (red symbols) are at different distances from the center (mean point of 90 s immediate preictal energy and entropy profile shown in yellow symbols) of the disk D, calculated from a separate set of preictal epochs. Any point inside the disk D counts for the inclusion rate of the distribution. (b) Temporal distribution of the amount of time spent inside the disk D in the same preictal (red dots) and interictal (black dots) energy and entropy profiles shown in (a). The dots indicate points inside the disk (each point represents 2 s duration). The persistence is the period of time corresponding to the maximum number of temporally contiguous points in the disk D. In this example preictal persistence is 22 pts × 2 s = 44 s and interictal persistence is 4 pts × 2 s = 8 s.