Question 1

What is the uncanny valley?

Accepted Answer

The uncanny valley is the sharp drop in comfort people feel toward a figure that looks almost, but not perfectly, human. Coined by roboticist Masahiro Mori in 1970, it describes how near-human faces provoke unease and revulsion rather than warmth.

Question 2

Why do almost-human faces creep us out?

Accepted Answer

Almost-human faces trigger a prediction error: the brain expects a real person and mind behind the face, then finds movement, eyes, or expressions that fail to deliver. Theories link the resulting dread to instincts about disease and corpses, and to our inability to read the intentions behind an empty face.

Question 3

Why do the eyes matter most in the uncanny valley?

Accepted Answer

Humans instinctively read minds through eyes, so lifelike eyes without the involuntary micro-movements of a living gaze feel especially wrong. Studies show faces are eeriest when features mismatch in realism, and vacant or mismatched eyes on an otherwise lively face are the most reliable trigger.

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The Face That Almost Passes