Complex technology requires cultural innovations for distributing cognition.

Over the last decade, new research has shown how human collectives can develop technologies that no single individual could discover on their own. However, this research often overlooks how technology can become so complex that individuals cannot operate it on their own. At this level of technological complexity, distributing cognition is a necessary process for reducing cognitive load on individuals. Yet distributing cognition also imposes coordination costs as technological systems become larger and the individuals in these systems become more specialized. We describe a sprawling set of cultural innovations that facilitate cognitive distribution by reducing cognitive load, reducing coordination costs, or doing both. Preliminary evidence suggests that these cultural innovations co-evolve with technological complexity.