Cybernetics

Norbert Wiener coined 'cybernetics' in 1948 from the Greek kybernetes (steersman), defining it as the study of control and communication in the animal and the machine. The core insight is that the same mathematical principles govern regulation in biological organisms, mechanical systems, and social organizations. A thermostat, a human reaching for a cup, and a market correcting a price bubble all operate via negative feedback: sense the gap between desired and actual state, act to reduce it, sense again. Wiener saw that information — not energy — is the fundamental currency of control. This was revolutionary: it unified engineering, biology, and social science under one framework. First-order cybernetics studied observed systems; second-order cybernetics (Heinz von Foerster) recognized that the observer is part of the system being observed. Cybernetics gave birth to artificial intelligence, control theory, robotics, and cognitive science. Its emphasis on circular causality and self-regulation anticipated modern complexity theory and laid the groundwork for understanding how autonomous systems — biological or artificial — maintain themselves in a changing world.