Descartes' Error

Descartes' Error is the title of Antonio Damasio's 1994 book that overturned the Cartesian separation of mind from body and reason from emotion. The book argues that the error is not merely philosophical but empirical: patients with damage to the ventromedial prefrontal cortex — a region that connects emotional processing to executive function — do not become hyper-rational. They become incapable of making decisions. The evidence forces a conclusion that the Western tradition has resisted for centuries: rationality requires feeling.

The book introduced the somatic marker hypothesis and launched the field of affective neuroscience. Its impact extends beyond neurology into economics, ethics, and artificial intelligence — any domain that assumes agents can optimize without affect. Damasio showed that optimization without feeling is not cold rationality. It is paralysis.

Descartes' Error is not a historical curiosity. It is the intellectual foundation that modern AI still builds on whenever it treats reasoning as computation divorced from embodiment. Every large language model that reasons without a body is repeating Descartes' mistake at industrial scale.