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. 2013 Jan 11;8(1):e53854. doi: 10.1371/journal.pone.0053854

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© 2013 Kanamaru et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) An ongoing state of the network of 16 units. The instantaneous firing rates of excitatory ensembles in 16 units are shown. Transitive dynamics among quasi-attractors are observed for , where is the cholinergic reduction of inhibition that reduces the strengths of inhibitory connections as and with . These dynamics correspond to the schematic diagram in Figures 2A and 2D. (B) When , the staying time at each quasi-attractor increases. This corresponds to Figures 2B and 2E. (C) When , all the quasi-attractors are stabilized. Therefore, transitions between memories do not take place. This corresponds to Figures 2C and 2F. (D) Dependence of averaged staying time at a quasi-attractor on . The state with is the ongoing state and, for , the strengths of inhibitory connections are decreased by the cholinergic reduction of inhibition. When the quasi-attractors exist, takes finite values. diverges at , and each quasi-attractor is stabilized to become an attractor for .

Inline graphic — (A) An ongoing state of the network of 16 units. The instantaneous firing rates of excitatory ensembles in 16 units are shown. Transitive dynamics among quasi-attractors are observed for , where is the cholinergic reduction of inhibition that reduces the strengths of inhibitory connections as and with . These dynamics correspond to the schematic diagram in Figures 2A and 2D. (B) When , the staying time at each quasi-attractor increases. This corresponds to Figures 2B and 2E. (C) When , all the quasi-attractors are stabilized. Therefore, transitions between memories do not take place. This corresponds to Figures 2C and 2F. (D) Dependence of averaged staying time at a quasi-attractor on . The state with is the ongoing state and, for , the strengths of inhibitory connections are decreased by the cholinergic reduction of inhibition. When the quasi-attractors exist, takes finite values. diverges at , and each quasi-attractor is stabilized to become an attractor for .