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John A. Larson, who was a medical student in California.

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Q: Who invented the lie detector in 1921?
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Related questions

Why was the lie detector invented?

to see if people were lying


Were Polygraphs used in the Anastasia trial of l938 in Germany?

No, the 'lie detector' (polygraph) was not yet invented.


When were lie detectors invented?

There were many early attempts to build a lie detector, but in the end, scientists don't really believe they work well enough to be trusted.In 1885 Cesare Lombroso developed a machine used to measure changes in blood pressure for police cases.In 1904 a device by Vittorio Benussi was used to measure breathing.Sir James Mackenzie of Scone, Scotland invented an early lie detector or polygraph in the 1900s. His machine "could be used to monitor the cardiovascular responses of his patients by taking their pulse and blood pressure".In 1911 a device recording both blood pressure and galvanic skin response was invented by Dr. Reginald A. Larson of the University of California.In the 1920s William Marston made a device that used blood pressure and galvanic skin responses.In 1936 the Berkeley Psychograph, a blood pressure-pulse-respiration recorder was developed by C. D. Lee.In 1945 a device which recorded muscular activity accompanying changes in blood pressure was developed by John E. Reid.


Where can you get a lie detector?

California


Can Someone can get around lie detector?

yes people can it actually detects how nervous u are not really a lie detector


How can a lie be detected?

A lie detector test follows you pulse, if you are asked a question and your heart rate rises or falls then it will be a lie. If you can regulate your pulse you cannot be detected on a lie detector


What actors and actresses appeared in Lie Detector - 2005?

The cast of Lie Detector - 2005 includes: Rolonda Watts as Host


What do you call a lie detector?

AHH a lie detector ANSWER by Engl1sh: A perfessional typically uses the term 'polygraph' test.


When was the fire detector invented?

The ionization type smoke detector was invented in 1931 in Switzerland.


Major invention in 1880-1914?

The airplane was invented by the Wright brothers. The lie detector was created. The Air conditioner was invented. Crayons were founded. Albert Einstien created E=mc2. The modern escalator was invented.


Can a lie detector determine if someone stolen something or had knowledge it was stolen?

Lie detector results are not admissible in the courts in the United States. On rare occasions, a defense attorney and/or a district attorney may conduct a lie detector test if there are doubts about a case.


How is a lie detector prepared?

Heart rate