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Detecting Lies By Use Of A Polygraph 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. 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. The main machine that is used to detect lies is the polygraph which depends on physiological changes that happen when one is lying. 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. When one is lying their blood pressure which represents blood circulation in the body also rises. 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. The the electrical resistance of the subject’s skin is measured and any changes noted by the polygraph. 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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Results collected by the polygraph are represented in graphical form. 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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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 software also helps the examiner in converting the data into charts and other forms that may be necessary. One may be required to use other methods of detecting lies and not depend on the polygraph only.