LIE DETECTOR

Lie Detector

Lie Detector

Lie detector

The so-called lie detector truth machine or polygraph is a particular type of measuring instrument used to record responses physiological. Records changes in blood pressure, the heart rate, the respiratory rate and galvanic response or conductance of the skin, which are built to certain questions that are the subject tested. It also has the ability to measure parameters such as the motion of the respondent, in order to avoid possible countermeasures during interrogation.

It is considered that it was invented in 1938 by Leonard Keeler, Police Department Berkeley (California), who created the first three channels polygraph results ...