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. Author manuscript; available in PMC: 2021 Jun 29.
Published in final edited form as: Neuron. 2018 Dec 20;101(2):337–348.e4. doi: 10.1016/j.neuron.2018.11.034

Figure 7. Chaotic Population Firing Rate Dynamics Are Quenched by Attention.

Figure 7.

(A) Schematic of the numerical experiment. The spike train realizations in layer one and the initial states of the membrane potential of layer two neurons are identical across trials, while in each trial we randomized the initial states of the layer three neuron’s membrane potentials.

(B) Three representative trials of the layer three excitatory population rates in the attended state (left, rows 1–3). Bottom row: difference of the population rates across 20 trials. Right (rows 1–3): snapshots of the neuron activity at time point 1,864 ms. Each dot is a spike within 2 ms window from the neuron at that location. Right bottom: the synaptic current each layer three neuron receives from layer two at time 1,864 ms.

(C) Same as (B) for the network in the unattended state.

(D) Trial-to-trial variance of layer three population rates as a function of time. Right: mean variance across time.

(E) The layer three population rate tracks the layer two population rate better in the attended state. Both outputs and responses are smoothed with a 200 ms window.