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For use of polygraph as a lie detector see:Use of the polygraph in lie detection

A polygraph (commonly yet incorrectly referred to as a lie detector) is a device that measures and records several physiological variables such as blood pressure,respiration and skin conductivity.

History

The origins of the modern polygraph date to 1913, when William Moulton Marston, a psychology student at Harvard University, first used the systolic blood-pressure test as a method of lie detection. He wrote a second paper on the concept in 1915, when finishing his undergraduate studies. He entered Harvard Law School and graduated in 1918, re-publishing his earlier work in 1917. A more complex device recording both blood-pressure and galvanic skin response was invented by Dr. John A. Larson of the University of California

Construction and design

Manufacturers and models

References

et:Valedetektor es:Polígrafo fr:Détecteur de mensonge he:פוליגרף lt:Poligrafas nl:Leugendetectorpt:Polígrafo ru:Полиграф sr:Полиграф sv:Lögndetektoruk:Поліграф