Neural oscillations as a signature of efficient coding in the presence of synaptic delays

Chalk, Matthew and Gutkin, Boris S and Denève, Sophie (2016) Neural oscillations as a signature of efficient coding in the presence of synaptic delays. eLife, 5. Article number: e13824 . ISSN 2050-084X

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Official URL: http://dx.doi.org/10.7554/eLife.13824

Abstract

Cortical networks exhibit 'global oscillations', in which neural spike times are entrained to an underlying oscillatory rhythm, but where individual neurons fire irregularly, on only a fraction of cycles. While the network dynamics underlying global oscillations have been well characterised, their function is debated. Here, we show that such global oscillations are a direct consequence of optimal efficient coding in spiking networks with synaptic delays and noise. To avoid firing unnecessary spikes, neurons need to share information about the network state. Ideally, membrane potentials should be strongly correlated and reflect a ‘prediction error’ while the spikes themselves are uncorrelated and occur rarely. We show that the most efficient representation is when: (i) spike times are entrained to a global Gamma rhythm (implying a consistent representation of the error); but (ii) few neurons fire on each cycle (implying high efficiency), while (iii) excitation and inhibition are tightly balanced. This suggests that cortical networks exhibiting such dynamics are tuned to achieve a maximally efficient population code.

Item Type: Article
DOI: 10.7554/eLife.13824
Uncontrolled Keywords: oscillation, synapse, Excitation, gamma rhythm, membrane potential, noise, spike
Subjects: 500 Science > 570 Life sciences; biology > 571 Physiology
Research Group: Tkacik Group
SWORD Depositor: Sword Import User
Depositing User: Sword Import User
Date Deposited: 05 Dec 2016 15:32
Last Modified: 30 Aug 2017 14:35
URI: https://repository.ist.ac.at/id/eprint/700

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