Published online by Cambridge University Press: 01 January 2022
This article argues that scale dependence of physical and biological processes offers resistance to reductionism and has implications that support a specific kind of downward causation. I demonstrate how insights from multiscale modeling can provide a concrete mathematical interpretation of downward causation as boundary conditions for models used to represent processes at lower scales. The autonomy and role of macroscale parameters and higher-level constraints are illustrated through examples of multiscale modeling in physics, developmental biology, and systems biology. Drawing on these examples, I defend the explanatory importance of constraining relations for understanding the behavior of biological systems.
I would like to thank Julia Bursten, Annamaria Carusi, and Robert Batterman for inspiring conversations on this topic, and Julia in particular for organizing the symposium Matters of Scale: Multiscale Modeling across the Sciences at PSA 2017 in Atlanta. William Bechtel provided insightful comments to an earlier version of this article.