LIE DETECTOR EXAMINATIONS
Here you will find out some of your looming questions about this scary test. We cover exactly how the machine works, what to expect during your examination, and most importantly a FAQ'S page.
How does it work?
A polygraph testing machine does three things when hooked up to any subject. It measures your heart rate, breathing pattern, and your galvanic skin response (sweat on the palms of your hand). The examiner will then ask you a series of questions. From these readings the examiner will use their training to render a decision on wheather or not you are being deceptive.
What is a CVSA?
The CVSA measures changes in a person's voice caused by stress. Under stress, the nervous system kicks into high gear, sending the voice response into an abnormal range. A normal-range response, the truth, appear as peaks on the CVSA print out. Lies, or stress, look like squared-off blocks.
Under relaxed conditions, the human voicebox is under control of the central nervous system. With the onset of stress, as when people lie, changes occur in the voice that causes the inaudible FM component to diminish or disappear. Although inaudible, the change can be detected by the CVSA. Increased stress ultimately results in the loss of the inaudible FM signal. Since this loss can be measured, the CVSA indicates the presence of stress and thus, depending on its application, deception.
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How The Polygraph Test Works
What To Expect
FAQ'S
How To Pass The Polygraph Test
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POLYGRAPH TEST