Abstract
We studied the emergence of cell assemblies out of a locally connected random network of 10,000 integrate-and-fire units distributed on a 100×100 2D lattice. The network was composed of 80% excitatory and 20% inhibitory units with balanced excitatory/inhibitory synaptic weights. Excitatory–excitatory synapses were modified according to a spike-timing-dependent synaptic plasticity (STDP) rule associated with synaptic pruning. In presence of a stimulus and with independent random background noise (5 spikes/s), we observed that after 5·105 ms of simulated time, about 8% of the exc–exc connections remained active and were reinforced with respect to the initial strength. The projections that remained active after pruning tended to be oriented following a feed-forward converging–diverging pattern. This result suggests that topologies compatible with synfire chains may appear during unsupervised pruning processes.
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Iglesias, J., Eriksson, J., Pardo, B., Tomassini, M., Villa, A.E.P. (2005). Emergence of Oriented Cell Assemblies Associated with Spike-Timing-Dependent Plasticity. In: Duch, W., Kacprzyk, J., Oja, E., Zadrożny, S. (eds) Artificial Neural Networks: Biological Inspirations – ICANN 2005. ICANN 2005. Lecture Notes in Computer Science, vol 3696. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11550822_21
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DOI: https://doi.org/10.1007/11550822_21
Publisher Name: Springer, Berlin, Heidelberg
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