CONCEPT
Extended Cognitive Hygiene
Clark's 2025 term for the daily practices that maintain the biological brain's capacity for independent judgment within a cognitive system designed to make that capacity feel unnecessary.
The term sounds quaint against the scale of the transformation it addresses, but it is chosen with precision. Hygiene is not medicine — it is not the dramatic intervention that addresses a crisis. It is the daily practice that prevents the crisis. Cognitive hygiene, in the extended mind framework, is the set of practices that maintain the biological brain's capacity for independent judgment, critical evaluation, and metacognitive monitoring within a cognitive system whose computational component is extraordinarily powerful and extraordinarily difficult to monitor. Clark introduced the term in his 2025 Nature Communications paper, calling it one of the most urgent practical challenges of the AI age.
In The You On AI Field Guide
The need arises from a structural asymmetry. The biological brain brings embodied grounding, contextual sensitivity, evaluative judgment, and metacognitive monitoring — the capacity to assess its own cognitive outputs. The computational component brings processing speed, associative breadth, and tireless availability, but lacks embodied grounding and metacognitive capacity. The extended system needs both