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This article is part of the supplement: Abstracts from the Twenty Second Annual Computational Neuroscience Meeting: CNS*2013

Open Access Poster presentation

Computational optimum of recurrent neural circuits at intermediate numbers of nonlinear dendritic branches

David Breuer134, Marc Timme123 and Raoul-Martin Memmesheimer5*

Author Affiliations

1 Network Dynamics, Max Planck Institute for Dynamics & Self-Organization, Göttingen, Germany

2 Bernstein Center for Computational Neuroscience Göttingen, Göttingen, Germany

3 Fakultät für Physik, Georg-August-Universität Göttingen, Göttingen, Germany

4 Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany

5 Donders Institute, Department for Neuroinformatics, Radboud Universiteit Nijmegen, Nijmegen, Netherlands

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BMC Neuroscience 2013, 14(Suppl 1):P273  doi:10.1186/1471-2202-14-S1-P273

The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2202/14/S1/P273


Published:8 July 2013

© 2013 Breuer et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Poster presentation

How neurons process their inputs crucially determines the dynamics of biological and artificial neural networks. Synaptic input is typically considered to be merely transmitted linearly or sublinearly by the dendritic compartments. Yet, single-neuron experiments report pronounced supralinear dendritic summation of sufficiently synchronous and spatially close-by inputs. Here, we study its influence on single neuron responses and the performance of associative memory networks. First, we compute the effect of random input to a neuron incorporating nonlinear dendrites. This approach is independent of the details of the neuronal dynamics. Second, we use those results to study the impact of dendritic nonlinearities on the network dynamics in a Hopfield-type associative memory model, both numerically and analytically. We find that dendritic nonlinearities maintain network convergence and increase the robustness of memory performance against noise (Figure 1A). Interestingly, an intermediate number of dendritic branches is optimal for memory functionality (Figure 1B,C).

thumbnailFigure 1. Nonlinear dendrites increase the robustness of associative memory retrieval against noise, optimally at an intermediate number of branches. (A) Overlap m of the network state with a retrieval pattern for linear dendrites (black) and increasing strengths of the dendritic nonlinearity (gray, yellow, red). The critical temperature TC at which the overlap becomes zero increases with increasing nonlinearity. Analytical and numerical results are given by continuous curves and circles, respectively. (B) Overlap vs. temperature-curves for different numbers of dendritic branches, increasing branch numbers are color-coded from black to red. The critical temperature depends non-monotonically on the number of branches and assumes a maximum at an intermediate value (C).