This one has more info than the last post.
https://www.sciencedaily.com/releases/2019/07/190701144308.htmRobots that are not quite life-like: 'Uncanny valley' in the brainScientists have identified mechanisms in the human brain that could help explain the phenomenon of the 'Uncanny Valley' -- the unsettling feeling we get from robots and virtual agents that are too human-like. They have also shown that some people respond more adversely to human-like agents than others.
As technology improves, so too does our ability to create life-like artificial agents, such as robots and computer graphics -- but this can be a double-edged sword.
"Resembling the human shape or behaviour can be both an advantage and a drawback," explains Professor Astrid Rosenthal-von der Pütten, Chair for Individual and Technology at RWTH Aachen University. "The likeability of an artificial agent increases the more human-like it becomes, but only up to a point: sometimes people seem not to like it when the robot or computer graphic becomes too human-like."
This phenomenon was first described in 1978 by robotics professor Masahiro Mori, who coined an expression in Japanese that went on to be translated as the 'Uncanny Valley'.