CONCEPT
The Sensing-and-Acting Loop
The foundational biological circuit from which all cognition evolved—an organism taking in information about its world and using that information to act in ways that serve its survival—whose presence in living things and effective absence in AI systems defines the precise location of the gap between natural mind and artificial intelligence.
The sensing-and-acting loop is the deepest root of mind in
Peter Godfrey-Smith's evolutionary account. Before there was anything recognizable as cognition, there was the loop: an organism that could detect features of its environment and adjust its behavior accordingly. A bacterium sensing a chemical gradient and swimming toward food. A simple animal detecting light and moving. These are not minds, but they are the substrate from which mind evolved, because they establish the fundamental circuit that all cognition elaborates: the loop in which an organism takes in information about its world and uses that information to do something that matters to its survival. What distinguishes this loop from mere information processing is that it is closed around a life. The sensing serves the acting, and the acting serves the organism's persistence. Information, in living systems, is never free-floating: it is always
information for an