Traditional lie detectors base their results on touch, measuring heart rate, sweat and so on, but a new lie detection software based on real data works without touching the subject.
- The new lie-detection software ‘reads’ people’s words and gestures
- It has a 75% accuracy compared to 50% accuracy a human has
- A person who is lying is more likely to look you in the eyes.
This new software is created to be able to detect lies by observing the words and gestures of the person that is being investigated. So far, the prototype has shown a 75 percent accuracy after being tested on video clips. The videos were media coverage of a number of 120 court trials. Compared to a human’s ability to detect lies, the machine performed better by approximately 15%.
Scientists identified some indicators of lies in a person’s behavior. Their gestures and mimics or tone of voice can show that their lying, without the person realizing it as he or she is doing them unconsciously. For example people who lie tend to grimace or scowl when they are being questioned. They also move their hands more and are more likely to look their questioner straight in the eyes. What they try to control is their voice, making it sound clearer and more certain.
Rada Mihalcea, a Romanian professor at the University of Michigan is leading the project and explained why they chose to use real data for the research. It seems that it’s difficult to make people lie, even if you try to pay them. But when they are in a court room where the stakes are a lot higher, people find it easier to deceive.
The researchers measured the frequency of certain words the subjects used to repeat and using a standard coding scheme they counted the gestures the subjects were making in the videos. The gestures refer to movements not only of hands but also of the head, eyes and mouth.
The next step will be to integrate physiological parameters into the software. Being able to read and measure body temperature, heart and respiration rate will make the software even more accurate, as it combines the features of the traditional lie-detectors with new artificial intelligence.
In conclusion, we should be expecting to be able to spot lies a lot faster and a lot more accurate in the near future, thanks to this lie-detecting software based on real data from court trials.
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