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Computers see through faked expressions of pain better than people

Date:
March 20, 2014
Source:
University of California - San Diego
Summary:
Scientists have found that a computer system spots real or faked expressions of pain more accurately than people can. Humans could not discriminate real from faked expressions of pain better than random chance -- and, even after training, only improved accuracy to a modest 55 percent. The computer system attains an 85 percent accuracy.

Which expression do you think shows real pain? Attempts to fake expressions of pain typically involve the same facial muscles that are contracted during real pain. There is no telltale facial muscle whose presence or absence would indicate real or faked pain. The difference is in the dynamics. The real expression of pain is image B on the right.
Credit: Image courtesy of University of California - San Diego

A joint study by researchers at the University of California, San Diego and the University of Toronto has found that a computer system spots real or faked expressions of pain more accurately than people can.

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The work, titled "Automatic Decoding of Deceptive Pain Expressions," is published in the latest issue of Current Biology.

"The computer system managed to detect distinctive dynamic features of facial expressions that people missed," said Marian Bartlett, research professor at UC San Diego's Institute for Neural Computation and lead author of the study. "Human observers just aren't very good at telling real from faked expressions of pain."

Senior author Kang Lee, professor at the Dr. Eric Jackman Institute of Child Study at the University of Toronto, said "humans can simulate facial expressions and fake emotions well enough to deceive most observers. The computer's pattern-recognition abilities prove better at telling whether pain is real or faked."

The research team found that humans could not discriminate real from faked expressions of pain better than random chance -- and, even after training, only improved accuracy to a modest 55 percent. The computer system attains an 85 percent accuracy.

"In highly social species such as humans," said Lee, "faces have evolved to convey rich information, including expressions of emotion and pain. And, because of the way our brains are built, people can simulate emotions they're not actually experiencing -- so successfully that they fool other people. The computer is much better at spotting the subtle differences between involuntary and voluntary facial movements."

"By revealing the dynamics of facial action through machine vision systems," said Bartlett, "our approach has the potential to elucidate 'behavioral fingerprints' of the neural-control systems involved in emotional signaling."

The single most predictive feature of falsified expressions, the study shows, is the mouth, and how and when it opens. Fakers' mouths open with less variation and too regularly.

"Further investigations," said the researchers, "will explore whether over-regularity is a general feature of fake expressions."

In addition to detecting pain malingering, the computer-vision system might be used to detect other real-world deceptive actions in the realms of homeland security, psychopathology, job screening, medicine, and law, said Bartlett.

"As with causes of pain, these scenarios also generate strong emotions, along with attempts to minimize, mask, and fake such emotions, which may involve 'dual control' of the face," she said. "In addition, our computer-vision system can be applied to detect states in which the human face may provide important clues as to health, physiology, emotion, or thought, such as drivers' expressions of sleepiness, students' expressions of attention and comprehension of lectures, or responses to treatment of affective disorders."


Story Source:

The above story is based on materials provided by University of California - San Diego. The original article was written by Paul K. Mueller. Note: Materials may be edited for content and length.


Journal Reference:

  1. Marian Stewart Bartlett, Gwen C. Littlewort, Mark G. Frank, Kang Lee. Automatic Decoding of Facial Movements Reveals Deceptive Pain Expressions. Current Biology, 2014 DOI: 10.1016/j.cub.2014.02.009

Cite This Page:

University of California - San Diego. "Computers see through faked expressions of pain better than people." ScienceDaily. ScienceDaily, 20 March 2014. <www.sciencedaily.com/releases/2014/03/140320121902.htm>.
University of California - San Diego. (2014, March 20). Computers see through faked expressions of pain better than people. ScienceDaily. Retrieved November 21, 2014 from www.sciencedaily.com/releases/2014/03/140320121902.htm
University of California - San Diego. "Computers see through faked expressions of pain better than people." ScienceDaily. www.sciencedaily.com/releases/2014/03/140320121902.htm (accessed November 21, 2014).

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