An early adopter of this concept, Charles Darwin, describes in "Voyage of the Beagle” an "uncanny" feeling when confronted with the face of a snake.
"I imagine this repulsive aspect originates from the features being placed in positions, with respect to each other, somewhat proportional to the human face; and thus we obtain a scale of hideousness."( Darwin p87)
Darwin, C. 1906 ,The Voyage of the Beagle. No. 104. London, JM Dent & sons.