Pathological lier test8/16/2023 Under this interrogation method, the interrogator will ask the subject a series of questions that would and wouldn’t be related to the reason of questioning. The most common method of interrogation under the polygraph machine would be the CQT, or the Control Questions Test. Insight into how the subjects are feeling can therefore be obtained by measuring human reaction corresponding to psychological change, such as the galvanic skin response. The activity in the eccrine sweat glands are not under conscious control, and so are a direct reflection of one’s emotional state. The fluctuations in the amount of electricity that is being conducted through the fingers will be graphed on a polygraph. This increase in conductivity is measured by attaching electrodes to a person’s fingertips. Our anxiety is directly proportional to the activity of the eccrine sweat glands, so the increased nervousness felt by a person will result in them sweating more, making their skin momentarily more conductive to electricity. Galvanic skin conductivity is the change in the electrical resistance of the skin caused by emotional stress. What the polygraph machine is actually capable of, however, is monitoring three measures of physiological response: heart rate, blood pressure, and galvanic skin conductivity. The name “lie detector” can be very deceptive, as this can lead people to believe that the machine has the ability to peer into people’s thoughts and determine precisely when they lie. Additionally, the polygraph machine had 0% accuracy when measuring participants from the 13 to 17-year-old age bracket. Out of the twenty tests that were conducted, the interrogator was able to correctly guess when the subjects lied in 6 tests, giving the polygraph machine an accuracy rate of 30%, which was much lower than predicted. Five different age groups were tested ranging from children ages 8 and under to seniors over 55 years old two males and two females were present in each age group. Their skin conductivity and heart rate were recorded and analyzed to determine when the test subjects lied. The test subjects were then asked a series of questions that would force them to lie. Heart rate was also measured using a monitor that clips onto the test subjects’ middle fingers. The Arduino software enabled a computer to graph the levels of the test subject’ sweat on a serial monitor. Specifically, the machine monitors skin conductivity using a breadboard, a few wires, three LEDs, and an Arduino nano chip connecting the breadboard to a computer. ![]() The purpose of this experiment is to determine the accuracy of polygraph machines by building a model machine to monitor physiological responses to lying. ![]() However, the legitimacy of these machines has been long questioned in the scientific community. ![]() From movies to real life, polygraph machines, otherwise known as lie detectors, have been used as a means to seek the truth since 1921.
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