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Polygraph
- The instrument, with its diverse collection of physiological indices, became known as the polygraph, which Larson then fully developed for forensic use in 1921, and applied it in police investigations at the Berkeley Police Department.
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The instrument, with its diverse collection of physiological indices, became known as the polygraph, which Larson then fully developed for forensic use in 1921, and applied it in police investigations at the Berkeley Police Department.
Feb 2, 2019 · John Augustus Larson, a medical student and officer at the Berkeley Police Department in California, invented the cardio-pneumo psychogram in 1921, a device that monitored systolic blood pressure and breathing depth, and recorded it on smoke-blackened paper.
The lie detector—or polygraph machine–was first created by John Augustus Larson (1892-1965), a part-time employee of the Berkeley Police Department who was earning his Ph.D. in physiology at the University of California at Berkeley in 1920.
Dec 11, 2013 · The Berkeley Police Department hired Larson onto the force and in 1921, he developed his most famous apparatus, the polygraph (Greek for "many writings"), which simultaneously scratched out...
In 1921, John Augustus Larson, a medical student and police officer in Berkeley, California invented a machine to help detectives determine if someone was telling the truth – or lying. He called it – the Polygraph.
In 1921, Earl Bryant made another instrument for John Larson, which was used at the Berkeley Police Department. It is believed that this second instrument was a duplicate of the first. This is the instrument that brought fame to Larson’s experiments and that drew the young Leonarde Keeler into the field of detection of deception.
Jul 8, 2015 · The first polygraph was created in 1921, when a California-based policeman and physiologist John A. Larson devised an apparatus to simultaneously measure continuous changes in blood pressure, heart rate and respiration rate in order to aid in the detection of deception (Larson, Haney, & Keeler, 1932; McCormick, 1927 ).
