Neuronal Avalanches Differ from Wakefulness to Deep Sleep – Evidence from Intracranial Depth Recordings in Humans
Figure 1
The global correlation structure between units is reflected in the avalanche distribution.
A. Each of the four raster plots depicts events from a different stochastic process with 44 units each. Each process had the same event rate (¼Hz) but different correlations structures between its 44 units: independent Poisson processes (green), stochastic input to two different subsets of the units (pink), and high correlation between units (orange). The black dots represent events recorded from the human brain (44 electrodes, ¼Hz event rate). The horizontal gray line depicts the bin size applied to get the p(s) in (B). B. Each of the avalanche size distributions p(s) corresponds to one of the processes in (A). p(s) reflects the correlation structure of the data. High correlations resulted in more large avalanches (orange, pink), while the Poisson processes show f(s) close to an exponential (green). However, here only p(s) from the human data (black) showed a power law.