#Cardiograph definition trial#

Sir James Mackenzie was a cardiologist and studied cardiac arrhythmias. Also, they rated and measured the depth of the person’s respiration. They recorded changes in the person’s blood pressure, blood volume changes. These researches led to the initial appearance of the basic design of the polygraph device.įrom 1895, many criminologists and people tried to build a perfect and functional lie detector machine. Since 1730, research has begun on the invention of a device that can detect lies. In general, the oldness of polygraph goes back to more than 300 years. In addition to the non-rationality of this method, it should be noted that even the innocent confessed to sin after long and painful torture. The Roman and Greek Empires usually used this method.

#Cardiograph definition trial#

In the trial by torture, the suspect is tortured in different ways. They believed that God will save the innocent. In this case, two people fought each other until one of them was killed. The criterion of trial by combat was physical strength. However, these methods were not reliable and scientific. As time passed and with the community development, people relied on the lie test on pure chance. Like the first one, if the individual would walk on red hot stones and his feet did not burn, he was not a liar. If his hand did not burn, he was a truthful person.Īnother irrational old and superstitious example is “ordeal of the red hot stones” test. In this test, the individual would put his hand in a bowl of boiling water. For instance, one method was the “ordeal of boiling water” test. In fact, a trial was held by combat, ordeal, or torture.įor this purpose, during the 18th-century people tried to invent methods. Simply put, they used three general methods. Despite the initiative, each material was relying on religious faith and superstition. But many of these were foolish, unreasonable and brutal. They used different inventive materials for confirmation of truth over the centuries. Mankind has found many methods to distinguish truthfulness from deception.

In the history of civilization, there have been futile or incomplete attempts to discover lies and to confirm the truth. Go to Polygraph School > The history of polygraph These tensions included changing in heart rate, feelings of anxiety or nervousness, person’s signals and other more which prove to lie. Polygraphs are based on this theory that people who lie or deceive, show physiological evidence of the tension. Notwithstanding the colloquial term, the polygraph does not recognize lies. Polygraph or lie detector utilizes mostly in law enforcement agencies and police investigations in order to examine deceptive reactions of individuals. For the first time in 1921, it was used as a lie detector. Therefore, the etymology of the polygraph originated from polys “much, many” and “Graphos” writing.īut as a term, the polygraph is a device to record the alternations of distinct pulsations simultaneously. The word polygraph is literally derived from the Greek word “Polygraphos” meaning writing much. In the end, you will get familiar with the polygraph usage in different agencies and the benefits of using it.

Then, it talks about the creation of polygraph idea and the theory. After a brief explanation of the title, the article will explain about the concise history of the polygraph. A Brief Introduction to Polygraph: This article will describe the etymology, word formation and definition of the polygraph to the readers.