Tuesday, April 9, 2013

1304.1865 (Kaare Mikkelsen et al.)

Emergence of slow collective oscillations in neural networks with spike
timing dependent plasticity

Kaare Mikkelsen, Alberto Imparato, Alessandro Torcini
The collective dynamics of excitatory pulse coupled neurons with spike timing dependent plasticity (STDP) is studied. The introduction of STDP induces persistent irregular oscillations between strongly and weakly synchronized states, reminiscent of brain activity during slow-wave sleep. We explain the oscillations by a mechanism, the Sisyphus Effect, caused by a continuous feedback between the synaptic adjustments and the coherence in the neural firing. Due to this effect, the synaptic weights have oscillating equilibrium values, and this prevents the system from relaxing into a stationary macroscopic state.
View original: http://arxiv.org/abs/1304.1865

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