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. 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. 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. 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. 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. Immediately after the rise in the breathing rates shallow breathing which is characterized by decrease in depth of the breath occurs. Such variations are easily detected by the polygraph lie detector since the machine has a pneumographic aspect. When one is lying their blood pressure which represents blood circulation in the body also rises. The the cardiographic aspect of the polygraph ensure that it also easily detects the change in blood pressure. Another important sign that someone is lying is the increase in sweat discharge from their bodies. The galvanograph aspect of the polygraph which uses the principle of electrical conductivity of the 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.
A Brief Rundown of Tests
All the results that are collected by the polygraph lie detector are recorded in the form of a graph. Initially recording of the information collected by a polygraph was done by tracing it on a chart paper. 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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A digital polygraph possess other numerous benefits. The ability to analyze information collected by use of software that has been developed is one key advantage associated with digital polygraph. The the software is also designed to convert the information into the required format for analysis by the examiner. It is advisable that one does not rely on the polygraph as the only test to determine whether the subject is lying.