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A new study has revealed two relatively simple methods that can be used to trap a brain imaging lie detector, which uses a functional MRI (fMRI) instead of a traditional polygraph system. In contrast to the techniques used to evade the usual lie detection methods, the researchers discovered that a person undergoing a brain imaging detection test could dramatically reduce the accuracy of the findings with two thinking techniques.
Compared to polygraphs, brain imaging is considered a more reliable way to determine if a person is lying because they are monitoring the blood flow in the participant's brain. The idea is that if the person tries to hide his recognition of what is concerned, the IRMfr will reveal larger amounts of blood in areas of the brain that are working very hard to hide the information.
Researchers at the University of Plymouth have identified two measures to reduce by 20% the accuracy of results of lie detectors for brain imaging. The first method involved associating "significant memories" with the control element, a different element from the one the participant was trying to conceal.
The brain of a person who, for example, has stolen a particular object and is presented with several objects, including the stolen object, may reveal that the person has knowledge of the stolen object when he sees it. Associating something meaningful with one of the other objects can increase their response, thus helping to mask the changes that occur when they see the target object.
In addition, the researchers revealed that subjects can reduce the accuracy of the results by focusing on a superficial aspect of the target object, such as its color or shape, to reduce the brain's response to the object. The fMRI system was struggling to find differences in brain activity when these methods were used, resulting in a loss of accuracy of about 20%.
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