Use Of Polygraph 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. 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. The main machine that is used to detect lies is the polygraph which depends on physiological changes that happen when one is lying. 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. 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. The the cardiographic aspect of the polygraph ensure that it also easily detects the change in blood pressure. There is also an increase in the amount of sweat that is discharged through our skins when we tell a lie. A polygraph has galvanograph aspect which measures the difference in electrical resistance of the subject’s skin. The method does not measure the amount of sweat that one produces directly, but it measures electrical conductivity which is bound to increase with the increase of perspiration amount. Since sweat is ionic it is used as an electrolyte in this case, and any increased conductivity means increased amount of sweat which implies that the subject lied.
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Results collected by the polygraph are represented in graphical form. Initially recording of the information collected by a polygraph was done by tracing it on a chart paper. But in the modern technological era polygraphs are connected to laptops which saves all the information hence eliminating the tiresome work of analyzing the results using 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. The ability to analyze information collected by use of software that has been developed is one key advantage associated with digital polygraph. The software includes capabilities to analyze charts and is specifically designed to help the examiners in their analysis. However one cannot depend entirely on the lie detector to detect lies.