Polygraph: Blood Pressure And Breathing Patterns

Ever wonder if someone is being dishonest with you?What would you do if there was a machine that could catch them in the act.The Polygraph also known as The Lie Detector was first patented in the 18th Century.
The Science and technology behind the polygraph. The purpose of the Polography was to detect lies in the most efficient and accurate way. ¨ Though the most commonly known name of the polygraph is lie detector the machine cannot detect lies. The polygraph detects physiological changes in the body that are supposedly reflectant of or similarly to the physiological condition of a liar. Though first polography nor the ones to this date could detect lies however they could measure and record Heart rates, Blood Pressure and Breathing patterns. …show more content…
James MacKenzie built the first prototype Polygrapher though it wasn't meant to detect lies but used to help medical research and diagnose heart disease. In 1902 James MacKenzie designed an lacking device he called a “polygraph,” which gave the investigator access to coordinate the artery and vein pulses along with the beat of the heart. This device allowed Mackenzie to make important variations between harmless and dangerous types of pulse distortion. Based on James MacKenzie's work along with some innovation John Larson designed the polygraph as we use it today. In 1921 John Larson, an EMT working with Berkeley Police Department, invented the first standardized polygraph in 1921. This first polygraph monitored both a subject's blood pressure and respiration . Under John Larson's presumptions. Inconsistency in blood pressure and breathing patterns would better help detect lies.After years of experimenting with ways to advance the machine, the polygraph was computerized in 1992, this allowed the polygraph to perform more efficiently. Thanks to John Larson and James MacKenzie's research we were able to push the techknowledgey of the polygraph further using there base and understanding. John Larson and James MacKenzie great inventions contributed greatly to society along the the legal and justice

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Polygraph: Blood Pressure And Breathing Patterns

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