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A Multi-scale View of the Emergent Complexity of Life: A Free-Energy Proposal

  • Casper HespEmail author
  • Maxwell Ramstead
  • Axel Constant
  • Paul Badcock
  • Michael Kirchhoff
  • Karl Friston
Conference paper
Part of the Springer Proceedings in Complexity book series (SPCOM)

Abstract

We review some of the main implications of the free-energy principle (FEP) for the study of the self-organization of living systems – and how the FEP can help us to understand (and model) biotic self-organization across the many temporal and spatial scales over which life exists. In order to maintain its integrity as a bounded system, any biological system – from single cells to complex organisms and societies – has to limit the disorder or dispersion (i.e., the long-run entropy) of its constituent states. We review how this can be achieved by living systems that minimize their variational free energy. Variational free energy is an information-theoretic construct, originally introduced into theoretical neuroscience and biology to explain perception, action, and learning. It has since been extended to explain the evolution, development, form, and function of entire organisms, providing a principled model of biotic self-organization and autopoiesis. It has provided insights into biological systems across spatiotemporal scales, ranging from microscales (e.g., sub- and multicellular dynamics), to intermediate scales (e.g., groups of interacting animals and culture), through to macroscale phenomena (the evolution of entire species). A crucial corollary of the FEP is that an organism just is (i.e., embodies or entails) an implicit model of its environment. As such, organisms come to embody causal relationships of their ecological niche, which, in turn, is influenced by their resulting behaviors. Crucially, free-energy minimization can be shown to be equivalent to the maximization of Bayesian model evidence. This allows us to cast evolution (i.e., natural selection) in terms of Bayesian model selection, providing a robust theoretical account of how organisms come to match or accommodate the spatiotemporal complexity of their surrounding niche. In line with the theme of this volume, namely, biological complexity and self-organization, this chapter will examine a variational approach to self-organization across multiple dynamical scales.

Keywords

Free-energy principle Active inference Self-organization Markov blanket Niche construction Variational neuroethology 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Casper Hesp
    • 1
    Email author
  • Maxwell Ramstead
    • 2
  • Axel Constant
    • 1
  • Paul Badcock
    • 3
  • Michael Kirchhoff
    • 4
  • Karl Friston
    • 5
  1. 1.Amsterdam Centre for Brain and CognitionUniversity of AmsterdamAmsterdamNetherlands
  2. 2.Department of PhilosophyMcGill UniversityMontrealCanada
  3. 3.Melbourne School of Psychological SciencesThe University of MelbourneMelbourneAustralia
  4. 4.Department of PhilosophyUniversity of WollongongWollongongAustralia
  5. 5.Wellcome Centre for NeuroimagingUniversity College LondonLondonUK

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