FIG. 5.

The results of ISC, though variable over single time segments, approaches a stable clustering. (A) The cumulative sum of M is shown for five consecutive time segments ( for ). M^sum, the sum over the entire signal, is shown on the far right. The cumulative sum quickly begins to resemble the final configuration. (B) Left: Two-dimensional correlation between clustering results when the cumulative sum is compared with itself at two time points (t−1) and (t+1). The correlation between clustering results approaches 98% in about one half hour. This result pools values across all subjects, with standard error shown. Right: The cumulative sum of clustering results also becomes very similar to the final clustering, but more slowly. At 3600 sec, correlation between sub-clustering results and the final results is at 95% across all subjects (with standard error shown).