The Fake Humans

Passing before a window display where the mannequin seems almost to look at you can be more disturbing than a clearly artificial object. This reaction, also observed facing automatons, digital characters, or social robots, has a name in psychology: the "uncanny valley."

In 1970, Japanese roboticist Masahiro Mori formulates the hypothesis. As an artifact gains in human resemblance, the sympathy it inspires grows—until a threshold where near-resemblance brutally tips into revulsion. Beyond this trough, a perfectly imitated human becomes acceptable again. Passing before a window display where the mannequin seems almost to look at you can be more disturbing than a clearly artificial object.

Several explanations coexist. The brain would detect anomaly cues—fixed gaze, too-smooth skin, absent micro-movements—interpreted as signals of illness or death. The almost-living object activates simultaneously the "human" and "non-human" categories, and this perceptual conflict generates discomfort. This reaction, also observed facing automatons, digital characters, or social robots, has a name in psychology: the "uncanny valley."

The effect today structures the design of social robots and synthetic characters: many prefer assumed stylization to risky realism. The uncanny valley shows that resemblance isn't a linear quality but a dangerous threshold.