Figure 4.
Network states are stable and diverse. Data shown in Figure 2A were analyzed except for E. A, Dunn index indicates the plausibility of separation (4 clusters, here). B, Data in the PC coordinate were divided into four discrete states with the fuzzy K-means algorithm. C, Time course of a shift in network states. D, Probabilities of state transitions between neighboring 10 s segments. E, Distribution of time spent for remaining in a single state showed a 1/timeα structure with α = 1.3. Data were collected from 15 slices. F, G, In ISI-shuffled (F) and event-exchanged (G) surrogates, Dunn indices were lower than those of the real data and not separable into stable states.