WEB DESK: If you think spotting a liar is easy then you need to think again, new research suggests
It states that the most untruthful people are likely to look you straight in the eye and give confident, well though-out responses.
They are also likely to grimace, make excessive hand gestures and use more vocal fill words such as ‘um’ and ‘err,’ according to experts at the University of Michigan.
The researchers have developed the first life-detecting software based on video footage of 120 court cases in the US which can spot someone who is lying 75 per cent of the time.
“In laboratory experiments, it’s difficult to create a setting that motivates people to truly lie. The stakes are not high enough,” said Dr Rada Mihalcea, professor of computer science and engineering who leads the project
“We can offer a reward if people can lie well–pay them to convince another person that something false is true. But in the real world there is true motivation to deceive.”
The team used video footage from both defendants and witnesses in high-stakes hearings, such as murder trials, transcribing their words and counting gestures.
People who lied were three times more likely to scowl or grimace, rather than keeping an open, relaxed face. Liars were also more likely to look directly at the questioner, gesture with both hands and use language to distance themselves from the proceedings – by using ‘he’ or ‘she’ rather than ‘I’ and ‘we.’
“People are poor lie detectors,” added Dr Mihalcea. “This isn’t the kind of task we’re naturally good at.
“There are clues that humans give naturally when they are being deceptive, but we’re not paying close enough attention to pick them up. We’re not counting how many times a person says ‘I’ or looks up. We’re focusing on a higher level of communication.”
“We are integrating physiological parameters such as heart rate, respiration rate and body temperature fluctuations, all gathered with non-invasive thermal imaging,” Burzo said.
The researchers are also exploring the role of cultural influence.
“Deception detection is a very difficult problem,” added Mihai Burzo, assistant professor of mechanical engineering at the University of Michigan. “We are getting at it from several different angles.”
The research was presented at the International Conference on Multimodal Interaction and is published in the 2015 conference proceedings.
Source: The telegraph