Fagerholm, Erik D; Dezhina, Zalina; Moran, Rosalyn J; Friston, Karl J; Turkheimer, Federico; Leech, Robert; (2023) Selection entropy: The information hidden within neuronal patterns. Physical Review Research , 5 (2) , Article 023197. 10.1103/PhysRevResearch.5.023197.

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Abstract

Boltzmann entropy is a measure of the hidden information contained within a system. In the context of neuroimaging, information can be hidden within the multiple brain states that cannot be distinguished within a single image. Here, we show that information can also be hidden within multiple indistinguishable selections of neuronal patterns between brain regions, as quantified by a novel metric that we term “selection entropy.” We show the ways in which selection entropy behaves in comparison with the Kullback-Leibler (KL) divergence (relative entropy). First, we use synthetic data sets to demonstrate that selection entropy is more sensitive to small changes in probability distributions compared with the KL divergence. Second, we show that selection entropy identifies a principal gradient between sensorimotor and transmodal brain regions more definitively than the KL divergence within resting-state functional magnetic resonance imaging time series. As such, we introduce selection entropy as an additional asset in the analysis of neuronal functional selectivity.

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