Uncanny valley

Repliee Q2

The uncanny valley hypothesis holds that when robots and other facsimiles of humans look and act almost like actual humans, it causes a response of revulsion among human observers. The "valley" in question is a dip in a proposed graph of the positivity of human reaction as a function of a robot's lifelikeness.

It was introduced by Japanese roboticist Masahiro Mori in 1970, and 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 is famously elaborated upon by Sigmund Freud in a 1919 essay titled "The Uncanny" ("Das Unheimliche"). A similar problem exists in realistic 3D computer animation, such as with the films Final Fantasy: The Spirits Within, The Polar Express, and Beowulf.

Hypothesis

Mori's hypothesis states that as a robot is made more humanlike in its appearance and motion, the emotional response from a human being to the robot will become increasingly positive and empathic, until a point is reached beyond which the response quickly becomes that of strong repulsion. However, as the appearance and motion continue to become less distinguishable from a human being, the emotional response becomes positive once more and approaches human-to-human empathy levels.

This area of repulsive response aroused by a robot with appearance and motion between a "barely human" and "fully human" entity is called the uncanny valley. The name captures the idea that a robot which is "almost human" will seem overly "strange" to a human being and thus will fail to evoke the empathetic response required for productive human-robot interaction.

Theoretical basis

Hypothesized emotional response of human subjects is plotted against anthropomorphism of a robot, following Mori's statements. The uncanny valley is the region of negative emotional response towards robots that seem "almost human". Movement amplifies the emotional response.

A number of theories have been proposed to explain the cognitive mechanism underlying the uncanny valley phenomenon:

• Mate selection. Automatic, stimulus-driven appraisals of uncanny stimuli elicit aversion by activating an evolved cognitive mechanism for the avoidance of selecting mates with low fertility, poor hormonal health, or ineffective immune systems based on visible features of the face and body that are predictive of those traits.

• Mortality salience. An "uncanny robot elicits an innate fear of death and culturally-supported defenses for coping with death’s inevitability.... It is easy to see in the following examples how partially disassembled androids could play on subconscious fears of reduction, replacement, and annihilation: (1) A mechanism with a human facade and a mechanical interior plays on our subconscious fear that we are all just soulless machines. (2) Androids in various states of mutilation, decapitation, or disassembly are reminiscent of a battlefield after a conflict and, as such, serve as a reminder of our mortality. (3) Since most androids are copies of actual people, they are Doppelgaenger and may elicit a fear of being replaced, on the job, in a relationship, and so on. (4) The jerkiness of an android’s movements could be unsettling because it elicits a fear of losing bodily control."

• Pathogen avoidance. Uncanny stimuli may activate a cognitive mechanism that originally evolved to motivate the avoidance of potential sources of pathogens by eliciting a disgust response. “The more human an organism looks, the stronger the aversion to its defects, because (1) defects indicate disease, (2) more human-looking organisms are more closely related to human beings genetically, and (3) the probability of contracting disease-causing bacteria, viruses, and other parasites increases with genetic similarity.” Thus, the visual anomalies of android robots and animated human characters have the same effect as those of corpses and visibly diseased individuals: the elicitation of alarm and revulsion.

• Western constructions of human identity. The existence of artificial but humanlike entities is a threat to human identity as socially constructed in the West and the Middle East but not in the Far East, partly because Western religions and philosophies emphasize human uniqueness..

• Sorites paradoxes. Stimuli with human and nonhuman traits undermine our sense of human identity by linking qualitatively different categories, human and nonhuman, by a quantitative metric, degree of human likeness.

• Violation of Human Norms. The uncanny valley may "be symptomatic of entities that elicit a model of a human other but do not measure up to it." If an entity looks sufficiently nonhuman, its human characteristics will be noticeable, generating empathy. However, if the entity looks almost human, it will elicit our model of a human other and its detailed normative expectations. The the nonhuman characteristics will be noticeable, giving the human viewer a sense of strangeness. In other words, a robot stuck inside the uncanny valley is no longer being judged by the standards of a robot doing a passable job at pretending to be human, but is instead being judged by the standards of a human doing a terrible job at acting like a normal person.

Transhumanism

According to writer Jamais Cascio, a similar "uncanny valley" effect could show up when humans begin modifying themselves with transhuman enhancements (cf. body modification), which aim to improve the abilities of the human body beyond what would normally be possible, be it eyesight, muscle strength, or cognition. So long as these enhancements remain within a perceived norm of human behavior, a negative reaction is unlikely, but once individuals supplant normal human variety, revulsion can be expected. However, according to this theory, once such technologies gain further distance from human norms, "transhuman" individuals would cease to be judged on human levels and instead be regarded as separate entities altogether (this point is what has been dubbed "posthuman"), and it is here that acceptance would rise once again out of the uncanny valley.

Criticism

Some roboticists have heavily criticized the theory, arguing that Mori had no basis for the rightmost part of his chart, as human-like robots have only recently become technically possible. David Hanson, a roboticist who has developed realistic robotic copies of several people, including Albert Einstein and Philip K. Dick, said that the idea of the uncanny valley is "really pseudoscientific, but people treat it like it is science." Sara Kiesler, a human-robot interaction researcher at Carnegie Mellon University, questioned uncanny valley's scientific status, stating, "We have evidence that it's true, and evidence that it's not."

Roboticist Dario Floreano stated that the concept of the uncanny valley is not based on scientific evidence, but is taken seriously by the film industry due to negative audience reactions to the animated baby in Pixar's 1988 short film Tin Toy. People's cultural backgrounds may have a considerable influence on how androids are perceived, including their perception of the uncanny valley (which implies that one raised in a culture of transhumans may not see as uncanny individuals who would to a modern-day person seem uncanny).

Popular culture

• The 2004 CGI animated film The Polar Express was criticized by reviewers who felt that the appearances of the characters were "creepy" or "eerie".
• In the 2008 30 Rock episode "Succession", Frank Rossitano explains the uncanny valley concept, using a graph and Star Wars examples, to try to convince Tracy Jordan that his dream of creating a pornographic video game is impossible. He also references Polar Express.

See also

• Affective computing
• Android science
• Bunraku
• Frankenstein complex
• Gynoid
• RealDoll
• Virtual Woman

References

• Bartneck, C., Kanda, T., Ishiguro, H., & Hagita, N. (2007). Is the Uncanny Valley an Uncanny Cliff? Proceedings of the 16th IEEE, RO-MAN 2007, Jeju, Korea, pp. 368–373. DOI:10.1109/ROMAN.2007.4415111 html
• Carpenter, J., Davis, J., Erwin‐Stewart, N. Lee. T., Bransford, J. & Vye, N. (2008).Invisible machinery in function, not form: User expectations of a domestic humanoid robot. Proceedings of the 6th conference on Design and Emotion. Hong Kong, China.
• Carpenter, J., Eliot, M. & Schultheis, D. (2006). The Uncanny Valley: Making human-nonhuman distinctions. Proceedings of the 5th International Conference on Cognitive Science, 81-82.Vancouver, B.C., Canada.
• Carpenter, J., Eliot, M. & Schultheis, D. (2006). Machine or friend: understanding users’ preferences for and expectations of a humanoid robot companion. Proceedings of 5th conference on Design and Emotion, CD-ROM. Gothenburg, Sweden.
• Green, R. D., MacDorman, K. F., Ho, C.-C., & Vasudevan, S. K. (2008). Sensitivity to the proportions of faces that vary in human likeness. Computers in Human Behavior, 24(5), 2456–2474.
• Ho, C.-C., MacDorman, K. F., & Pramono, Z. A. D. (2008). Human emotion and the uncanny valley: A GLM, MDS, and ISOMAP analysis of robot video ratings. Proceedings of the Third ACM/IEEE International Conference on Human-Robot Interaction. March 11-14. Amsterdam.
• Ishiguro, H. (2005). Android science: Toward a new cross-disciplinary framework. CogSci-2005 Workshop: Toward Social Mechanisms of Android Science, 2005, pp. 1–6.
• MacDorman, K. F. (2005). Androids as an experimental apparatus: Why is there an uncanny valley and can we exploit it? CogSci-2005 Workshop: Toward Social Mechanisms of Android Science, 106-118. (An English translation of Mori's "The Uncanny Valley" made by Karl MacDorman and Takashi Minato appears in Appendix B of the paper.)
• MacDorman, K. F. & Ishiguro, H. (2006). The uncanny advantage of using androids in cognitive science research. Interaction Studies, 7(3), 297-337.
• MacDorman, K. F. (2006). Subjective ratings of robot video clips for human likeness, familiarity, and eeriness: An exploration of the uncanny valley. ICCS/CogSci-2006 Long Symposium: Toward Social Mechanisms of Android Science. July 26 2006. Vancouver, Canada.
• MacDorman, K. F., Vasudevan, S. K., & Ho, C.-C. (2009). Does Japan really have robot mania? Comparing attitudes by implicit and explicit measures. AI & Society, 23(4), 485-510.
• MacDorman, K. F., Green, R. D., Ho, C.-C., & Koch, C. (2009). Too real for comfort: Uncanny responses to computer generated faces. Computers in Human Behavior, 25, 695-710.
• Mori, Masahiro (1970). Bukimi no tani The uncanny valley (K. F. MacDorman & T. Minato, Trans.). Energy, 7(4), 33–35. (Originally in Japanese)
• Mori, Masahiro (2005). On the Uncanny Valley. Proceedings of the Humanoids-2005 workshop: Views of the Uncanny Valley. 5 December 2005, Tsukuba, Japan.
• Ramey, C.H. (2005). The uncanny valley of similarities concerning abortion, baldness, heaps of sand, and humanlike robots. In Proceedings of the Views of the Uncanny Valley Workshop, IEEE-RAS International Conference on Humanoid

Robots.

External links

• IEEE-RAS Humanoids-2005 Workshop: Views on the Uncanny Valley. Was held in Tsukuba, Japan, near Tokyo on December 5 2005.
• The Uncanny Valley (Dave Bryant)
• Almost too human and lifelike for comfort - research journal for an uncanny valley PhD project
• Relation between motion and appearance is communication between androids and humans
• Android Science video, the Discovery Channel, 24 March 2005, discusses android science, the uncanny valley and features an Actroid.
• Wired article: "Why is this man smiling?", June 2002.
• The Polar Express: A Virtual Train Wreck, Part 1 - Animation Director Ward Jenkins discusses in length about the use of motion capture in the film. In Part 2, he tries to "fix" the uncanny valley problem by using Photoshop to tweak some of the characters in the film.