The uncanny valley is a hypothesis in the field of roboticsand 3Dcomputer animation, which holds that when human replicas look and act almost, but not perfectly, like actual human beings, it causes a response of revulsion among human observers. The "valley" refers to the dip in a graph of the comfort level of humans as a function of a robot's human likeness.The term was coined by the robotics professor Masahiro Morias Bukimi no Tani Genshō (不気味の谷現象) in 1970. The hypothesis has been linked to Ernst Jentsch's concept of "the uncanny" identified in a 1906 essay, "On the Psychology of the Uncanny". Jentsch's conception was elaborated bySigmund Freud in a 1919 essay entitled "The Uncanny" ("Das Unheimliche").
'Mori's original hypothesis states that as the appearance of a robot is made more human, a human observer's emotional response to the robot will become increasingly positive and empathic, until a point is reached beyond which the response quickly becomes that of strong revulsion.'