13-08-2013, 04:07 PM
LIE DETECTOR
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INTRODUCTION
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.
A polygraph (popularly referred to as a lie detector) measures and records several physiological indices such as blood pressure, pulse, respiration, and skin conductivity while the subject is asked and answers a series of questions. The belief is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers.
Many members of the scientific community consider polygraphy to be pseudoscience. Nonetheless, in some countries polygraphs are used as an interrogation tool with criminal suspects or candidates for sensitive public or private sector employment. US federal government agencies such as the FBI and the CIA and many police departments such as the LAPD use polygraph examinations to interrogate suspects and screen new employees.
Signs of Deception:
Body Language of Lies:
Physical expression will be limited and stiff, with few arm and hand movements. Hand, arm and leg movement are toward their own body the liar takes up less space.
A person who is lying to you will avoid making eye contact.
Hands touching their face, throat & mouth. Touching or scratching the nose or behind their ear. Not likely to touch his chest/heart with an open hand.
X13-VSA Software:
The X13-VSA is a revolutionary new software product that work with your PC or laptop computer for quick and reliable recorded truth verification. Anyone with a computer can use it. X13-VSA looks for changes in voice tone and frequency and performs thousands of mathematical calculations to identify signs that someone could be lying.
You can make a Real-time analysis or take any recorded conversation, record yourself, spouse, friend, lover etc., . Of course when you do this make sure you obtain consent from the person whose voice you are analyzing!
Verbal Context and Content:
A liar will use your words to make answer a question. When asked, “Did you eat the last cookie?” The liar answers, “No, I did not eat the last cookie.”
A statement with a contraction is more likely to be truthful: “ I didn't do it” instead of “I did not do it”
Liars sometimes avoid "lying" by not making direct statements. They imply answers instead of denying something directly.
The guilty person may speak more than natural, adding unnecessary details to convince you... they are not comfortable with silence or pauses in the conversation.