A polygraph machine detects physiological changes such as an increase or decrease in heartbeat, the rate of breathing and perspiration (Bullok, 2021). It is used as a lie detector and detects a lie when there is an increase in the heartbeat or a spike in blood pressure. You can deceive a polygraph test by altering the results of the control question. A control question is a query asked whose answer is used to judge how you respond to other questions. You can also control your breathing so that the polygraph machine does not detect a change in the rate of breathing. Inflicting pain upon yourself by biting your tongue alters stress response hence makes it hard for the detective to compare reactions accurately. You can also induce panic by thinking of something that frustrates you, frightens you or makes you upset. This causes a spike in blood pressure hence messing up the results. It’s also advisable to keep your answers short and where applicable respond with a yes or no. Avoid giving unnecessary information and only respond to the question asked. You can also contract your muscles and speak in an even tone.
A computer voice stress analyzer detects delicate changes in a person’s voice. You can mislead a computer voice stress analyzer by taking slow deep breaths that will stimulate the release of oxytocin. This is a hormone that lowers stress levels and anxiety. Sighing while yawning also works since it lowers the larynx thus increasing airspace in the middle of vocal cords. This opens up the throat and makes your voice sound relaxed. You should also look out for how you say things which is more accurate than what you actually mean. If carried out correctly, this counter-measures are very effective and can help you pass a polygraph or a computer voice stress analyzer test.
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References
Bullock, R. M. (2021). Examining the Impact of Occupational Stress on Polygraph Examiners in the United States (Doctoral dissertation, Ashford University).
