RT Journal Article SR Electronic T1 Informational Basis of Sensory Adaptation: Entropy and Single-Spike Efficiency in Rat Barrel Cortex JF The Journal of Neuroscience JO J. Neurosci. FD Society for Neuroscience SP 14921 OP 14926 DO 10.1523/JNEUROSCI.1313-13.2013 VO 33 IS 37 A1 Adibi, Mehdi A1 Clifford, Colin W. G. A1 Arabzadeh, Ehsan YR 2013 UL http://www.jneurosci.org/content/33/37/14921.abstract AB We showed recently that exposure to whisker vibrations enhances coding efficiency in rat barrel cortex despite increasing correlations in variability (Adibi et al., 2013). Here, to understand how adaptation achieves this improvement in sensory representation, we decomposed the stimulus information carried in neuronal population activity into its fundamental components in the framework of information theory. In the context of sensory coding, these components are the entropy of the responses across the entire stimulus set (response entropy) and the entropy of the responses conditional on the stimulus (conditional response entropy). We found that adaptation decreased response entropy and conditional response entropy at both the level of single neurons and the pooled activity of neuronal populations. However, the net effect of adaptation was to increase the mutual information because the drop in the conditional entropy outweighed the drop in the response entropy. The information transmitted by a single spike also increased under adaptation. As population size increased, the information content of individual spikes declined but the relative improvement attributable to adaptation was maintained.