Government subsidies, research programs and hard work of scientists from many areas, seek to introduce fully computerised analysis of results registered while monitoring physiological changes in the body. The software also needed for this is update continuously and with every year it is becoming more and more accurate.
The result of a many-year study is a computer system which contains analog-to-digital converters, specialist software and modern equipment. An autonomic reactions indicator has also been invented. It is possible to use it in modern devices – the used algorithm enables the examiner to receive more than twenty different calculations, which concern registered biological information. The register of physiological changes is saved on a magnetic disc while the examination record is displayed on the screen and can be printed at any time.
The use of computer technology for research and complicated statistic calculations enables us for a more precise and objective reactions analysis. Despite that, it must only be treated as an supplement to the traditional, laboratory method.
Polygraphs, also known as lie detectors are mentioned many times, even though sometimes we might not even realise it. The popular equipment tends to appear in movies, books. They can also be seen during real life investigations and cases. Candidates applying for investigator or government posts are also often required to undergo polygraph testing. The main aim of such an examination is to determine, whether the person sitting in the examination seat is honest or not about the statements given. It comes without doubt, that the polygraph is a very useful and important tool. So who is responsible for presenting the first Lie Detector and how does it really work?
The first polygraph lie detector dates back to 1921 when John Larson – a medicine student at The University of California came up with a device which, he claimed, was able to determine the truthfulness of a person. From the moment the device was presented to the public, suspicions and worries aroused whether it was actually possible to find out if somebody is telling the truth or not. This led to concerns regarding the accuracy of the polygraph lie detector performed tests which have kept on up to this day.
Today’s polygraph lie detectors are up-to-date devices with an extremely high accuracy level. This is mainly thanks to the fact, that the examination is based on measurements made of the body’s natural processes. This consists of blood pressure, pulse, breathing rate, perspiration or skin conductivity. Whenever a person is lying, certain behaviours occur. The above reactions are practically uncontrollable by us, that is why the exam has such good results. Of course, there are stories saying that there are ways to cheat the polygraph and it would be a lie to deny such a statement. There are certain kinds of people which have the ability of cheating a lie detection test. But this requires very long and professional training which is absolutely unavailable for normal citizens. Read more – The history of the polygraph
The accuracy of the polygraph test also greatly depends on the examiner himself. In order to receive a good, accurate result it is important to hire an expert which has the appropriate experience to perform such services. If this kind of examination is conducted by somebody without any training, it is obvious that the results will not be satisfactory. A well-qualified examiner also has another, very important task to fulfil. Undergoing a polygraph test is generally known as a stressful experience, especially for persons who are innocent. Fear of a being falsely accused can very often influence the outcome of the test. It is thanks to the professionalism of our experts, that we are able to see the difference between stress and lying.
Once the interrogation is finished and the measurements are transferred to a computer software, an analysis chart is printed and the examiner start searching for abnormalities which will provide the needed answers. Only a professional examiner has the possibility of finding the right reactions and symptoms of lying. Hiring an experienced expert is absolutely vital for the success of the test.
Do you want to find out more about the science of lie detection? You will have seen them in the movies or TV shows, but there’s a lot more to lie detection than meets the eye. You may have questions, how do polygraphs work? Can they be cheated? Find out more by reading our guides and publications on lie detectors and the psychology behind lying.