Before revision:  Since the electrode used has 16-contact points, we construct non-overlapping but sliding 100 , 000 sample-windowed correlation matricesor functional connectivity (FC) matrices over the recorded time, yielding signed graphs. Our results from the clustering methods both at the pre-ictal and post-ictal periods of the depth recording reported here for the first time yield convincing answers to differing community structures .
After revision:  Since the electrode used has 16-contact points, we construct non-overlapping but sliding 100 , and its results are compared with the ones obtained by applying the same methods to coherency matrices. The correlation matrices show a much finer community structure compared to the coherency matrices. Furthermore, we examine the potential smoothing effect of choosing various window sizes for computing the correlation/coherency matrices .