| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Cortical networks sustain asynchronous irregular firing with low firing rate. Recent theoretical studies have revealed that coexistence of many weak and a few extremely strong excitatory synapses, plays an essential role in realizing the self-sustained activity. However, highly nonrandom features of the synaptic connectivity, i.e. cluster structure or bidirectional connections between cortical neurons have not been considered. The positive correlation of synaptic connections destabilize asynchronous activity Here, we show that the synchronization can be efficiently suppressed by highly heterogeneous distribution, typically a lognormal distribution, of inhibitory-to-excitatory connection in a recurrent network model of cortical neurons. We also found that clusters are not isolated in cortical network independently. Rather, they connected each other and globally they form so-called a small world network in local cortical network.
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