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How A Polygraph Machine Is Used 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. As much as we ought, to tell the truth always there are times when we are liable of lying especially to avoid the punishment that one should receive if they accepted their wrongdoings. When one decides to lie their bodies are likely to react which is indicated through various measurable physiological changes that are utilized by lie detecting machines as we get nervous and also anxious. A polygraph is the main machine that has been widely used to detect lies since the machine depends on the physiological changes. 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. 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. The amount of sweat coming out through the skin is also bound to increase at the event of one telling a lie. The galvanograph aspect of the polygraph which uses the principle of electrical conductivity of the skin. The act of detecting a lie from the changes in amount of sweat is not dependent on the machine measuring the amounts of sweat but rather conductivity which increases with increase in amount of sweat since sweat is used as the electrolyte. Increase in the amount of sweat means an increase in concentration of the electrolyte and hence higher conductivity by the skin.
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All the results that are collected by the polygraph lie detector are recorded in the form of a 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. Polygraphs nowadays can be connected to computers where all the information will be recorded quickly and hence save the examiners time and energy that would have been used to analyze papers. Computers also allow one to save significant results for different subjects for later analysis or reference purpose.
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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. However one cannot depend entirely on the lie detector to detect lies.