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Lie Detector

13.01.1931

The study of physiological methods for deception tests measuring emotional disturbances began in the early 1900s. Benussi was the first to work on practical deception tests based on physiological changes. He detected changes in inspiration-expiration ratio—findings confirmed by N.E. Burtt. Burtt conducted studies that emphasized the changes in quantitative systolic blood-pressure. William Moulton Marston studied blood-pressure and noted increase in systolic blood pressure of 10 mm Hg or over indicated guilt through using the tycos sphygmomanometer, with which he reported 90-100% accuracy. His studies used students and actual court cases. Then in 1913 W.M. Marston determined systolic blood-pressure by oscillatory methods and his findings cite definite changes in blood pressure during the deception of criminal suspects. In 1921, John Augustus Larsoncriticized Marston's intermittent blood pressure method because emotional changes were so brief they could be lost. To adjust for this he modified the Erlanger sphygmograph to give a continuous blood pressure and pulse curve and used it to study 4,000 criminals

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A polygraph, popularly referred to as a lie detector, measures and records several physiological indices such as blood pressure, pulse, respiration, and skin conductivity while the subject is asked and answers a series of questions.[1] The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers.

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Demonstrating the administration of the polygraph, the polygrapher making notes on the readouts

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do polygraphs detect lies

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Two photos from your team are accepted as ok and they are posted in dotstorming.Vote, here in your padlet, among these two (that Athanasia has commented as ok-->iRENE'S nad NICOLETA'S PHOTOS)   so that we have your decision for the photo that we will post in the timeline. Description is ok for the timeline by Brahim's post.

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A new square photo for the timeline
source: http://i.imgur.com/Wom0i7h.jpg

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Most of you wasn't interested in lie detector price

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Mihaela Cocris, Dorohoi

Leonard Keeler, a disciple of John Larson, has mastered the first ever detecting machine ever created. The lie detector was his dream and his occupation of life. Keeler was supported by Vollmer in creating a new polygraph. This new car, built by Keeler with two of his colleagues in the classroom, was called "The Emotograph"Unfortunately, this car was destroyed in a fire at Keeler residence, but Keeler was so passionate about the work he started building a new "asap". This time, the device was created with Western Electro Mechanical Company and was sold to other police departments in the country. At that time, a polygraph was the price of about $ 1,500, which is about $ 20,000 in current dollars.(January 13, 1931)https://ingeniousinventions.wordpress.com/2009/02/28/the-lie-detector-polygraphy/

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Information from Brahim ammar are enough and fror a different use that we may have not thought i post this photo..... party lie detector!
a good source that i have used for the image: http://www.kenalder.com/liedetectors/machines.htm

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A polygraph, popularly referred to as a lie detector, measures and records several physiological indices such as blood pressure, pulse, respiration, and skin conductivity while the subject is asked and answers a series of questions. The belief underpinning the use of the polygraph is that deceptive answers will produce physiological responses that can be differentiated from those associated with non-deceptive answers.

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Leonard Keeler, a disciple of John Larson, has mastered the first ever detecting machine ever created. The lie detector was his dream and his occupation of life. Keeler was supported by Vollmer in creating a new polygraph. This new car, built by Keeler with two of his colleagues in the classroom, was called "The Emotograph"Unfortunately, this car was destroyed in a fire at Keeler residence, but Keeler was so passionate about the work he started building a new "asap". This time, the device was created with Western Electro Mechanical Company and was sold to other police departments in the country. At that time, a polygraph was the price of about $ 1,500, which is about $ 20,000 in current dollars.(January 13, 1931)https://ingeniousinventions.wordpress.com/2009/02/28/the-lie-detector-polygraphy/

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Although not always reliable, lie detectors, or polygraph machines, have been used to uncover lies for generations; they represent a technological breakthrough in which an instrument tests a person's body signals to reveal indications of whether he or she is lying; Leonard Keeler constructed the new machine named “The Emotograph” with two of his college buddies in between classes; unfortunately this machine was destroyed in a fire at Keeler residence; but Keeler was so passioned about his job that he began to design a new instrument,  this time the device was created with Western Electro Mechanical Company, and was even sold to other police departments in the country. The patent was filled on July, 30 1925 by Keeler at the United States Patent Office and was issued in January, 13 1931 with patent number 1,788,434 under the name: APARATUS FOR RECORDING ARTERIAL BLOOD.
Source: https://en.wikipedia.org/wiki/Polygraph
photo:
Leonarde Keeler testing his lie-detector on a former witness for the prosecution at the trial of Bruno Hauptmann in 1937

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In 1921 , a medical student named John Larson invented the modern lie detector. Although it recorded several different physiological responses : the subjects pulse rate, blood pressure and respiratory rate , it wasn't as advanced as the one we're currently using .