A. Shown are the average slope parameters

and the standard deviations (error bars). The three different estimation methods are: LS least-square estimation with logarithmic binning, KS Kolmogorov-Smirnov statistic, and ML maximum likelihood estimation (see

*Materials and Methods*). Estimated values of

were not statistically different: in vitro, F(2,18) = 0.19,

*p* = 0.827; in vivo (anesthesia), F(2,18) = 0.124,

*p* = 0.884; in vivo (awake), F(2,3) = 0.21,

*p* = 0.821 (one-way ANOVA). Values of

were estimated for the entire range of cluster sizes, i.e., from avalanches that included only one electrode to clusters that spanned the entire multielectrode array. B. Autocorrelation of the avalanche sizes for monkey X and Y as a function of the avalanche lag. The autocorrelation showed a fast decay within 10 avalanches (arrow). The shaded areas indicate the autocorrelation (

3 SD) for randomly permuted cluster sizes for both monkeys. C. Average

values obtained by ML estimation as a function of avalanche lag for monkey X and Y (red and green line, respectively). Error bars denote the standard deviation across the decorrelated sub-sets. The gray lines show mean

SD of ML parameter estimates for sample-size matched data from the original sequence of cluster sizes.

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