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Optimal Encoding in Stochastic Latent-Variable Models

1
Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
2
Institute of Neuroinformatics, University of Zürich and ETH, 8057 Zürich, Switzerland
3
Institute for Adaptive and Neural Computation, School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, UK
*
Author to whom correspondence should be addressed.
Entropy 2020, 22(7), 714; https://doi.org/10.3390/e22070714
Received: 25 May 2020 / Revised: 23 June 2020 / Accepted: 23 June 2020 / Published: 28 June 2020
(This article belongs to the Special Issue Thermodynamics and Information Theory of Living Systems)
In this work we explore encoding strategies learned by statistical models of sensory coding in noisy spiking networks. Early stages of sensory communication in neural systems can be viewed as encoding channels in the information-theoretic sense. However, neural populations face constraints not commonly considered in communications theory. Using restricted Boltzmann machines as a model of sensory encoding, we find that networks with sufficient capacity learn to balance precision and noise-robustness in order to adaptively communicate stimuli with varying information content. Mirroring variability suppression observed in sensory systems, informative stimuli are encoded with high precision, at the cost of more variable responses to frequent, hence less informative stimuli. Curiously, we also find that statistical criticality in the neural population code emerges at model sizes where the input statistics are well captured. These phenomena have well-defined thermodynamic interpretations, and we discuss their connection to prevailing theories of coding and statistical criticality in neural populations. View Full-Text
Keywords: information theory; encoding; neural networks; sensory systems information theory; encoding; neural networks; sensory systems
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Rule, M.E.; Sorbaro, M.; Hennig, M.H. Optimal Encoding in Stochastic Latent-Variable Models. Entropy 2020, 22, 714.

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