DVD: www.amazon.com thefilmarchive.org Lie detection is the practice of attempting to determine whether someone is lying. Activities of the body not easily controlled by the conscious mind are compared under different circumstances. Usually this involves asking the subject control questions where the answers are known to the examiner and comparing them to questions where the answers are not known. Critics claim that "lie detection" by use of polygraphy has no scientific validity because it is not a scientific procedure. Lie detection commonly involves the polygraph. Voice stress analysis may also be commonly used because it can be applied covertly to monitor voice recordings. The polygraph detects changes in body functions not easily controlled by the conscious mind. These include bodily reactions like skin conductivity and heart rate. Cognitive polygraph Recent developments that permit non-invasive monitoring using functional transcranial Doppler (fTCD) technique showed tha! t successful problem-solving employs a discrete knowledge strategy (DKS) that selects neural pathways represented in one hemisphere, while unsuccessful outcome implicates a non-discrete knowledge strategy (nDKS). A polygraphic test could be viewed as a working memory task. This suggests that the DKS model may have a correlate in mnemonic operations. In other words, the DKS model may have a discrete knowledge base (DKB) of essential components needed for task resolution, while for nDKS, DKB is absent ...
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