Figure 1.

Mori's uncanny valley curve demonstrating the non-linear relationship between the human-likeness of stimuli (clearly artificial to fully human-like) and the observers' sense of affinity for them (negative to positive). Human-likeness levels (L₁ to L4) that correspond roughly with the turning points of the curves have been highlighted on the horizontal axis, and the uncanny valley proper has been emphasized with a dark gray color. Adapted with permission from MacDorman (2005).