| Presentation | 2007-11-19 Colored Noise Stabilizes Asynchronous Persistent Activity Kosuke HAMAGUCHI, Nicolas BRUNEL, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Prefrontal neurons shows persistent activity during the delay period of working memory tasks. A natural way to explain the mechanism of working memory is to assume the transition between attractor states. The conventional models of attractor network, such as the Hopfield network, assumes an excitatory reverberation loop, but the irregular spike patterns before and during the delay period are difficult to explain solely on the basis of excitatory feedback. To generate irregular spike patterns, the balance of excitatory and inhibitory inputs is required. An open question here is, how to combine balanced input and bistability. Here we present the conditions for which both the irregular spiking and bistability are found, by using a population of randomly, and sparsely connected Leaky Integrate-and-Fire (LIF) neurons as a simple model of local cortical circuits. For the instantaneous synapse model, our analytical calculation shows that the wide region of the bistable region with high spike irregularity is actually in the oscillatory unstable region. This oscillation destroys the bistable states. However, a realistic synaptic filtering is shown to stabilize the asynchronous state and expand the bistable region, indicating the fundamental role of synaptic filtering on the stability of the working memory. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Working Memory / CV / Prefrontal cortex / Oscillation / Inhibition dominated network |
| Paper # | NC2007-67 |
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| Committee | NC |
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| Conference Date | 2007/11/11(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Neurocomputing (NC) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Colored Noise Stabilizes Asynchronous Persistent Activity |
| Sub Title (in English) | |
| Keyword(1) | Working Memory |
| Keyword(2) | CV |
| Keyword(3) | Prefrontal cortex |
| Keyword(4) | Oscillation |
| Keyword(5) | Inhibition dominated network |
| 1st Author's Name | Kosuke HAMAGUCHI |
| 1st Author's Affiliation | RIKEN, Brain Science Institute() |
| 2nd Author's Name | Nicolas BRUNEL |
| 2nd Author's Affiliation | Laboratoire de Neurophysique et Physiologie |
| Date | 2007-11-19 |
| Paper # | NC2007-67 |
| Volume (vol) | vol.107 |
| Number (no) | 328 |
| Page | pp.pp.- |
| #Pages | 6 |
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