Metabolically efficient information processing.

TitleMetabolically efficient information processing.
Publication TypeJournal Article
Year of Publication2001
AuthorsBalasubramanian, V, Kimber, D, Berry, MJ
JournalNeural Comput
Volume13
Issue4
Pagination799-815
Date Published2001 Apr
ISSN0899-7667
KeywordsAction Potentials, Algorithms, Energy Metabolism, Information Theory, Models, Neurological, Retinal Ganglion Cells, Synaptic Transmission
Abstract

<p>Energy-efficient information transmission may be relevant to biological sensory signal processing as well as to low-power electronic devices. We explore its consequences in two different regimes. In an "immediate" regime, we argue that the information rate should be maximized subject to a power constraint, and in an "exploratory" regime, the transmission rate per power cost should be maximized. In the absence of noise, discrete inputs are optimally encoded into Boltzmann distributed output symbols. In the exploratory regime, the partition function of this distribution is numerically equal to 1. The structure of the optimal code is strongly affected by noise in the transmission channel. The Arimoto-Blahut algorithm, generalized for cost constraints, can be used to derive and interpret the distribution of symbols for optimal energy-efficient coding in the presence of noise. We outline the possibilities and problems in extending our results to information coding and transmission in neurobiological systems.</p>

Alternate JournalNeural Comput
PubMed ID11255570