Uncanny valley

In aesthetics, the uncanny valley is a hypothesized relationship between the degree of an object's resemblance to a human being and the emotional response to such an object. 

An empirically estimated uncanny valley for static robot face images. image: wikipedia

The concept of the uncanny valley suggests humanoid objects which appear almost, but not exactly, like real human beings elicit uncanny, or strangely familiar, feelings of eeriness and revulsion in observers. Valley denotes a dip in the human observer's affinity for the replica, a relation that otherwise increases with the replica's human likeness. 

Examples can be found in robotics, 3D computer animations, and lifelike dolls among others. With the increasing prevalence of virtual reality, augmented reality, and photorealistic computer animation, the 'valley' has been cited in the popular press in reaction to the verisimilitude of the creation as it approaches indistinguishability from reality. The uncanny valley hypothesis predicts that an entity appearing almost human will risk eliciting cold, eerie feelings in viewers.

Source adapted from: Wikipedia contributors. (2019, April 2). Uncanny valley. In Wikipedia, The Free Encyclopedia. Retrieved 06:37, April 7, 2019, from https://en.wikipedia.org/w/index.php?title=Uncanny_valley&oldid=890649512