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Journal of Computational Neuroscience

, Volume 22, Issue 3, pp 301–312 | Cite as

Local cortical circuit model inferred from power-law distributed neuronal avalanches

  • Jun-nosuke Teramae
  • Tomoki Fukai
Article

Abstract

How cortical neurons process information crucially depends on how their local circuits are organized. Spontaneous synchronous neuronal activity propagating through neocortical slices displays highly diverse, yet repeatable, activity patterns called “neuronal avalanches”. They obey power-law distributions of the event sizes and lifetimes, presumably reflecting the structure of local circuits developed in slice cultures. However, the explicit network structure underlying the power-law statistics remains unclear. Here, we present a neuronal network model of pyramidal and inhibitory neurons that enables stable propagation of avalanche-like spiking activity. We demonstrate a neuronal wiring rule that governs the formation of mutually overlapping cell assemblies during the development of this network. The resultant network comprises a mixture of feedforward chains and recurrent circuits, in which neuronal avalanches are stable if the former structure is predominant. Interestingly, the recurrent synaptic connections formed by this wiring rule limit the number of cell assemblies embeddable in a neuron pool of given size. We investigate how the resultant power laws depend on the details of the cell-assembly formation as well as on the inhibitory feedback. Our model suggests that local cortical circuits may have a more complex topological design than has previously been thought.

Keywords

Neuronal wiring Synchronization Cell assembly Synfire chain Cortical network development 

Notes

Acknowledgments

The authors express their sincere thanks to T. Hensch and N. Yamamoto for fruitful discussions about the development of the cortical circuits. The present work was partially supported by Grants in Aid for Scientific Research of Priority Areas and Grant-in-Aid for Young Scientists (B) from the Japanese Ministry of Education, Culture, Sports, Science and Technology.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Laboratory for Neural Circuit TheoryRIKEN Brain Science InstituteWakoJapan

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