If you are planning to buy your own lie detector, one of the first things that you should know is that most of these are expensive. However, they are very reliable when it comes to knowing whether the person is telling the truth or not. There are lots of lie detectors that analyze one’s voice stress. But the interesting thing to that is that up until now, there is still no scientific study that proves this kind of lie detector.

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One of the other things that you should consider is the skin resistance feature of the lie detector. This is a vital parameter because the principle followed by this is that a person sweats when he or she lies. When you lie, you feel a considerable amount of stress, thus you sweat.

Medical Connection

In medical terms, this is called psychogalvanic reflex. This happens that when a person is stressed, he or she sweats. The other parameters that are observed by a lie detector is the person’s blood pressure, pulse, and breathing rhythm. Though these parameters are redundant, they still enable the quick assessment and analysis whether the person is telling the truth or not.

Knowing the Parameters of a Lie Detector Test

This is the reason why not all of these parameters are necessary. If you are planning to buy your own lie detector, then you should choose one that measures one or two of the parameters mentioned. This would surely save you a lot of money. Another parameter is the measurement of one’s skin resistance. With this, you can just consider buying a low noise computer based skin resistance meter. It also has the same function with a lie detector.