The regular conditioning of human beings does not allow them to lie because it is morally and also spiritually wrong. 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. A polygraph is the main machine that has been widely used to detect lies since the machine depends on the physiological changes.
There are observable changes that are likely to occur when one is lying, and one of the physiological change is the rise in breathing rate. Immediately after the rise in the breathing rates shallow breathing which is characterized by decrease in depth of the breath occurs. A polygraph quickly detects such changes since It has 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 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. 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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The polygraph records all the data collected during the test in the form of as graph. The polygraphs used to locate the data on graph papers in earlier methods used to record data. 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. It is also possible through a computer to carry out tests on multiple subjects where the computers store the results for later analysis or reference.
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Using a digital polygraph has several other benefits. 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. It is advisable that one does not rely on the polygraph as the only test to determine whether the subject is lying.