How a Lie Detector Machine Works
The attributes that the examiner is measuring are respiratory rate, blood pressure/heart rate and the galvanic skin resistance. The examiner places two tubes around your chest and abdomen to measure the respiratory rate. The air in the tubes is displaced when you breathe causing the mechanical arm on the machine to make marks on the paper whenever a breath is taken. The blood pressure/heart rate is measured through a blood pressure cuff placed around your upper arm. As the blood passes through the arm, it causes sounds to be transferred through the tubes to a pen on the machine. The galvanic skin resistance is measured through a fingerplate placed on two of your fingers. These plates measure the skin's ability to conduct electricity. This is done through the amount of sweat coming from a person's fingers. Electricity is conducted more easily through hydration (sweat) than if it is dry. These results can also be recorded on a computer by converting the results to electronic impulses that a specialized program reads.
Polygraphs do not detect lies; rather they detect the physiological responses to the questions the examiner is asking. This leads to some skepticism in regard to the accuracy of the test. A properly trained and experienced examiner can detect the various anomalies to include the stress of the test itself. Through these specific procedures that the examiner employs, the anxiety of the test will not penetrate that.
Published by Scott Ranzau
I currently live in Surprise Arizona. I have an AA degree in business administration with a concentration in criminal justice. I work as a community service officer for the Surprise Police Department. View profile
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13 Comments
Post a CommentI commented on this already a while ago, but am testing something...I think my AC glitch is finally fixed :) I can navigate the site logged in now!! I can comment as myself! Finally...
So basically if I randomly answer without any feelings of stress or truthfulness, I can beat the machine?
Great explanation of how the "Box" really works! I'm sure that there is a lot of anxiety associated with being 'hooked' up! Nice article...and thanks for the nice comments!
Great information, hope I never need one.
I always wondered how it worked!
Thanks for the info. I always wanted to see if I could "Beat" one but didn't want to do a crime to find out lol.
Yikes!! Those things scare me, Lol. Thanks for this... :o)
I have always wondered about this, great article!
Nice job, Scott! I've always wanted to see one of these used in person, or to test one out. There have been a few times I'd have liked to put a few, specific people on one!!!
Good article :)