How A Polygraph Machine Is Used To Detect Lies The regular conditioning of human beings does not allow them to lie because it is morally and also spiritually wrong. We, therefore, try to avoid being dishonest but there are times that we fear to tell the truth especially when we are under pressure having done the wrong thing and we are afraid of the consequences. The body through several physiological processes always responds to instances in which we tell lies since at that time one is nervous and anxious which triggers the physiological changes which can be monitored using lie detectors. Due to its ability to read and detect the physiological changes that happen when one lies, a polygraph is the most used machine to detect lies. There characteristic physiological changes that are associated with lying include an increase in breathing rate. A the difference in rates of breaths which is characterized by a sharp increase in breath rates followed by shallow breaths is experienced. The polygraph can detect such changes through its pneumograph aspect. Also when one is lying there is a sharp increase in their blood pressure. Again this is easily detected by the polygraph since it possesses cardiographic aspect to measure and identify such signs. 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. When the amount increases it ensures there is increase in electrolyte concentration since sweat is ionic liquid allowing electric current to pass through.
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The polygraph records all the data collected during the test in the form of as graph. In earlier times the polygraphs used to trace the measurements on to a chart paper where after the test the examiner would analyze the results. But modern polygraphs can be connected to computers where all the information will be saved and hence eliminate the task of analyzing data recorded as hard copy. Computers also provide a safe storage for data in case any further analysis is required or any future reference.
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There are other advantages that a digital polygraph has. One of the benefits is that experts have developed a software that helps to ease the process of analyzing data and information. The the software is also designed to convert the information into the required format for analysis by the examiner. However one cannot depend entirely on the lie detector to detect lies.