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Use Of Polygraph To Detect Lies Lying or being dishonest is against the central values that are widely accepted throughout the human population and has also been supported been supported by various religions through scriptures. Therefore no human being would want to find themselves lying, but when one is subjected to pressure especially if they are on the downside they are probably going to lie. Mainly when one is lying they are anxious and nervous which in turn produce unique physiological effects which may be visible or may be detected using lie detecting machines. A polygraph is the main machine that has been widely used to detect lies since the machine depends on the physiological changes. Though there are different physiological changes that occur in case one lies there are those that are common, and one such change is the increase in breath rate. A the difference in rates of breaths which is characterized by a sharp increase in breath rates followed by shallow breaths is experienced. Such variations are easily detected by the polygraph lie detector since the machine has a pneumographic aspect. Also when one is lying there is a sharp increase in their blood pressure. The polygraph has a cardiographic aspect that quickly detects the change in blood pressure when one is lying. The amount of sweat coming out through the skin is also bound to increase at the event of one telling a lie. A polygraph has galvanograph aspect which measures the difference in electrical resistance of the subject’s skin. The the method usually measures the electrical conductivity of the skin which is obliged to increase with the increase in an amount of sweat which is the electrolyte, but it does not measure the actual amount of sweat discharged. Since sweat is ionic it is used as an electrolyte in this case, and any increased conductivity means increased amount of sweat which implies that the subject lied.
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Results collected by the polygraph are represented in graphical form. The polygraphs used to locate the data on graph papers in earlier methods used to record data. But in the modern technological era polygraphs are connected to laptops which saves all the information hence eliminating the tiresome work of analyzing the results using papers. Computers also provide a safe storage for data in case any further analysis is required or any future reference.
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A digital polygraph possess other numerous benefits. One of the advantages is that there is software that is specially designed for analyzing information. the software also helps the examiner in converting the data into charts and other forms that may be necessary. However one cannot depend entirely on the lie detector to detect lies.