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Spontaneous activity in the model. Main graph: Activity (shown as mean firing rate in the network) dies out within the first few seconds of simulation regardless of the number of seed spikes introduced at the beginning of the simulation. (Inset) The model was simulated with a source of noisy input (spontaneous synaptic release, or “minis”) during the first 1,800 s; after the source of noise was turned off, the activity persisted.
