Is a bacterium choosing its path or just following a script?
In short: Biologists often argue that cells are simply puppets of chemistry and physics, lacking any true intent. Yet, the way a macrophage hunts a bacterium suggests a purposeful agenda. To understand if life possesses free will, we must first define the boundary between genetic hard-wiring and biological agency.
The debate centers on 'agency'—the capacity of a living system to alter its environment and itself with a specific purpose. While critics argue that single cells are merely reacting to chemical gradients, others point out that organisms do not react identically to every situation. For instance, a hare may act unpredictably to evade a wolf; an organism that reacts differently in identical scenarios has a higher chance of survival. This suggests that agency provides a layer of flexibility that genetic hard-wiring alone cannot provide. To model how an agent can produce an outcome that wouldn't happen spontaneously, physicist James Clerk Maxwell proposed a thought experiment involving a 'demon' that sorts hot and cold particles. While the second law of thermodynamics suggests this shouldn't happen, the demon achieves it by gathering and acting on information. However, there is a physical cost: to keep the demon functioning, its memory must be periodically wiped, which produces entropy. This highlights a fundamental tension in the physics of agency: the act of processing information to achieve a goal creates its own physical consequences. Research by Susanne Still and Gavin Crooks in 2012 suggests that for any entity with a goal—be it a cell, an animal, or a theoretical demon—memory is essential for energy efficiency. Efficient agents must be discerning, focusing only on the most useful information to avoid wasting energy. While human free will is complicated by memories, emotions, and social conditioning, the underlying mechanism of agency may be a universal feature of life, requiring just the right rules to navigate a complex world.
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