Figure 1
From: The scale-invariant, temporal profile of neuronal avalanches in relation to cortical γ–oscillations
Neuronal avalanches and γ–oscillations coexist during resting activity in prefrontal (PF) and premotor (PM) cortex of nonhuman primates. (a) Ongoing single electrode LFP with negative threshold crossing (−2 s.d.; dashed line) identifies the peak times of nLFPs (asterisks). (b) Concatenating successive time bins with at least 1 nLFP defines nLFP clusters of size 4, 5 (gray) at temporal resolution Δt on a 12-electrode array (schematic). (c) Power law in nLFP cluster sizes identifies avalanche dynamics (Δt = 〈IEI〉). Dashed line: power law with slope of −3/2. Arrow: cut-off at ~90 electrodes55. (d) Non-power law duration distributions of nLFP clusters at Δt = 〈IEI〉. (e) Power spectrum density (PSD) of the LFP with γ–activity peaks at 25–35 Hz. Average PSD per array (color coded) from single electrode PSDs. Dashed line: 1/f. (f) Peak frequency vs. 1/f-corrected γ–power for each electrode. Legend in c applies to (d–f).
