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The volunteers were asked questions that pertained to the situation, along with unrelated control questions. In all cases, the polygraph and fMRI accurately distinguished truthful responses from deceptive ones. fMRI showed activation in several areas of the brain during the deception process. These areas were located in the frontal (medial inferior and pre-central), temporal (hippocampus and middle temporal), and limbic (anterior and posterior cingulate) lobes. During a truthful response, the fMRI showed activation in the frontal lobe (inferior and medial), temporal lobe (inferior) and cingulate gyrus. Overall, there were regional differences in activation between deceptive and truthful conditions. Furthermore, there were more areas of the brain activated during the deception process compared to the truth-telling condition.
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That's a quote from an earlier
MRI lie detector study.
It seems that more emotion related areas get involved when a person is lying. The situation in this thread seems to indicate that self-deception uses a similar approach. Perhaps it contributes to the ability to disregard conflicting evidence. A skill that seems necessary to maintain specific views.
luckyme