Can we trust polygraphs? We’ve all heard of a polygraph, mostly known as the lie detector. According to (http://polygraphinnovations.weebly.com/who-invented-the-polygraph.html ) In 1921 John Larson created a polygraph instrument. Then in 1925 Leonarde Keeler collided with Larson and by 1938 they invented the polygraph as we know today. How do polygraphs even work? The investigator will come in and ask you simple questions to start off with. Then eventually lead up to the things they need to know. They watch the changes in your heart rate, blood pressure and movement on paper.
There has been different opinions on a polygraph. Some people believe that they have no use, that it’s not …show more content…
At first it started out with monitoring your heart rate. The machine was proven with physiological responses by electric signals which instructed needles to move and record the physiological change on a roll of paper. They also used them to trick people by scaring them and making the machine act up and saying you’re lying. If you think you’re about to get caught with a lie people usually confess right on the spot. Something else that’s improved about the testing is that they have respiratory data and facial thermal imaging. In respiratory data they record thoracic movements and volume change during testing. They have tubes strapped around the person's chest and the other is around the person's stomach.. Both tubes are connected to the machine. It records the person when they breathe in and out, with the pressure around the tubes changing its being recorded by the polygraph machine.
Facial thermal is another way they’ve used the polygraph. Around the eyes is where they test at mostly. Whenever a person is lying the blood flow in their face increases rapidly. Now they have also made lasers to detect the muscles on your face to tell if it’s anxiety or if the person is just flat out lying. The investigators can also have the person type out their answers on a computer, and how the temperature on their fingertips are and how fast/hard they type.
There has been different opinions on a polygraph. Some people believe that they have no use, that it’s not …show more content…
At first it started out with monitoring your heart rate. The machine was proven with physiological responses by electric signals which instructed needles to move and record the physiological change on a roll of paper. They also used them to trick people by scaring them and making the machine act up and saying you’re lying. If you think you’re about to get caught with a lie people usually confess right on the spot. Something else that’s improved about the testing is that they have respiratory data and facial thermal imaging. In respiratory data they record thoracic movements and volume change during testing. They have tubes strapped around the person's chest and the other is around the person's stomach.. Both tubes are connected to the machine. It records the person when they breathe in and out, with the pressure around the tubes changing its being recorded by the polygraph machine.
Facial thermal is another way they’ve used the polygraph. Around the eyes is where they test at mostly. Whenever a person is lying the blood flow in their face increases rapidly. Now they have also made lasers to detect the muscles on your face to tell if it’s anxiety or if the person is just flat out lying. The investigators can also have the person type out their answers on a computer, and how the temperature on their fingertips are and how fast/hard they type.