Sophie Van Der Zee & Ramsey Faragher: Body of Lies: Unobtrusively Measuring Deceptive Behaviour in Real Time
Duration: 18 mins 19 secs
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About this item
| Description: | (No description) |
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| Created: | 2015-09-28 17:35 |
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| Collection: | Decepticon 2015 |
| Publisher: | University of Cambridge |
| Copyright: | Dr S. Van der Zee |
| Language: | eng (English) |
| Keywords: | Deception; Motion capture; Nonverbal behaviour; |
| Abstract: | Recently, we demonstrated that motion-capture equipment can accurately measure differences in absolute full-body movement between truth tellers and liars (Van Der Zee, Poppe, Taylor, & Anderson, 2015). Liars moved more across all limbs than truth tellers did, and this effect became larger when combined with cognitive load-inducing interviewing techniques such as reverse- order questioning. To determine how much participants moved, we used full- body motion-capture suits because they are currently the most accurate way to measure movement. This novel methodology significantly outperformed human detection accuracy. However, expecting suspects to wear such suits during routine police interviews is impractical. This is problematic because the detection of deception is a research topic with high real-world value. Therefore, we are currently developing our motion-based lie detection research in two different ways. First, we are investigating if we can unobtrusively measure movements indicative of deceit without loss of accuracy. To this end, we are currently gathering data with a new test bed of sensors including depth-sensitive infra-red cameras and ultra-wideband radars. If successful, this technology will increase the practical applicability of motion-based lie detection. Cheaper technological alternatives will also lower the barrier for other research labs to start experimenting. Second, although understanding behavioural differences between truth tellers and liars is interesting from a theoretical point of view, it is only usable in practice if it is hard to imitate truthful behavior. Therefore, we are investigating whether our methodology is prone to the use of countermeasures. Both exploring unobtrusive measurements and investigating countermeasures strategies will provide a better insight into the ecological validity of our research and can help close the gap between research and practice. |
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