Behavior, Purpose and Teleology
Three authors proposed describing goal-directed behaviour through negative feedback, in the same terms for an animal and for a machine.
Why it matters
Purpose stopped being a property of living things and became a testable control scheme that could be built.
The paper separates behaviour that is teleological, meaning guided by feedback, from behaviour that is not. The authors do not claim a machine thinks; they claim that purpose in behaviour is described by a mechanism rather than by intent. This is the frame the Macy conferences and early cybernetics worked inside.