Fig. 2.

Basic properties of spontaneous activity. A: panel at top shows an example raster plot of spontaneous activity: each row represents a neuron, and black dashes signify subevents. Panel at bottom shows total (sum) activity of all neurons shown in the panel at top. B and C: normalized histograms of subevent duration and relative magnitude pooled from all data sets. D and E: histograms of activity ratio and subevent rate of all analyzed neurons. F: Lorenz curves of subevent rate observed across all neurons (solid black curve) and for a perfectly uniform distribution (dashed line). The shaded area between these curves is used to calculate the Gini coefficient. CF, cumulative fraction.