Too Close for Comfort

As robotics technology advances, engineers strive to create machines that look and act increasingly human. Intuitively, one might assume that the more human-like a robot appears, the more people will like it. However, in 1970, Japanese roboticist Masahiro Mori identified a curious phenomenon that contradicts this assumption. He coined the term "The Uncanny Valley" to describe a specific relationship between a robot's human resemblance and the emotional response it elicits in observers.

Mori proposed that as a robot becomes more human-like, our empathy towards it increases—but only up to a point. When the robot becomes almost human but still retains subtle non-human imperfections—such as stiff movements or dead-looking eyes—our emotional response abruptly shifts from empathy to revulsion. This dip in the graph of emotional response is the "valley." The feeling is often described as "eerie" or "creepy."

Psychologists have proposed several theories to explain this reaction. One is "pathogen avoidance": the idea that the imperfections remind our primal brains of a sick or dead body, triggering an instinctive avoidance mechanism to prevent disease. Another is "mortality salience," suggesting that human-like robots remind us that we are merely biological machines destined to die. To avoid the Uncanny Valley, many modern designers opt for stylized, non-human appearances (like big round eyes or cartoonish proportions) which tend to be universally perceived as cute rather than creepy.

Too Close for Comfort

As robotics technology advances, engineers strive to create machines that look and act increasingly human. Intuitively, one might assume that the more human-like a robot appears, the more people will like it. However, in 1970, Japanese roboticist Masahiro Mori identified a curious phenomenon that contradicts this assumption. He coined the term "The Uncanny Valley" to describe a specific relationship between a robot's human resemblance and the emotional response it elicits in observers.

Mori proposed that as a robot becomes more human-like, our empathy towards it increases—but only up to a point. When the robot becomes almost human but still retains subtle non-human imperfections—such as stiff movements or dead-looking eyes—our emotional response abruptly shifts from empathy to revulsion. This dip in the graph of emotional response is the "valley." The feeling is often described as "eerie" or "creepy."

Psychologists have proposed several theories to explain this reaction. One is "pathogen avoidance": the idea that the imperfections remind our primal brains of a sick or dead body, triggering an instinctive avoidance mechanism to prevent disease. Another is "mortality salience," suggesting that human-like robots remind us that we are merely biological machines destined to die. To avoid the Uncanny Valley, many modern designers opt for stylized, non-human appearances (like big round eyes or cartoonish proportions) which tend to be universally perceived as cute rather than creepy.