Cesare Lombroso, in 1895, was the first to utilize such an instrument, but it was not until 1914 and 1915 that Vittorio Benussi, Harold Burtt, and, above all, William Marston produced devices establishing correlation of blood pressure and respiratory changes with lying. In 1921 an instrument capable of continuously recording blood pressure, respiration, and pulse rate was devised by John Larson. This was followed by the polygraph (1926) of Leonarde Keeler, a refinement of earlier devices, and by the psychogalvanometer (1936) of Walter Summers, a machine that measures electrical changes on the skin. A more recent innovation is a device, developed in 1970, called the psychological stress evaluator, which measures voice frequencies from tape recordings. Although the lie detector is used in police work, the similarity of physical changes caused by emotional factors such as feelings of guilt to those caused by lies has made its evidence for the most part legally unacceptable. An assessment of such devices by National Research Council (an arm of the National Academy of Sciences ) found that they also were too unreliable to be used in screening for national security purposes, but they are widely used for such purposes nonetheless, sometimes with inconsistent results from one government agency to another. The use of lie detectors to screen employees and job applicants is highly controversial."lie detector." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 17 Jun. 2009 <http://www.encyclopedia.com/>.
Well done Sparks! I absolutely loved this post. I also have to give you credit for choosing such an interesting theme; it is a topic that I certainly appreciate. I found this particular post to be very informative. I was completely unaware of all the improvements and advancements relating to the different types of lie detectors. It is important to recognize the benefits that stem from such inventions. Although some argue the accuracy, they have helped to prove innocence and guilt in many court cases. Television shows such as CSI make it seem so easy to sit a person down and determine whether or not they are telling the truth. In reality, it is more of a “science”, it is a skill that one is trained for or specializes in. It will certainly be interesting to see how this progresses in the future!
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