Related Articles. Article Summary. Method 1. Say only what you need to. Resist the temptation to explain your answers or to go into details, although the polygrapher may try to get you to do so. Be courteous and cooperative, but do not offer any more information than is absolutely necessary. No matter what the lines on the chart look like, nothing is more certain or damaging than your confession. Remember that the job of polygraphers is to extract confessions.
In many ways, the whole examination is a complex ruse to trick you into confessing something. Answer questions firmly, seriously, and without hesitation. This is no time to joke around or try to be crafty. You want to appear earnest, cooperative and resolute. Breathe normally. Except during control questions, you should try to maintain a breathing rate of breaths per minute.
Do not breathe too deeply. Alter breathing rate with control questions. If the deviation from normal during control questions exceeds the deviation from normal during relevant questions, you will pass. If you react more to a relevant question than to control questions, the polygrapher will perceive rightly or wrongly that you are lying in response to something relevant and you will likely fail the polygraph.
Change your breathing pattern when a control question is asked. You can make it faster or slower, hold your breath for a couple seconds after an exhalation, or breathe more shallowly. Do this for seconds and return to your normal breathing pattern before the next question. Answer control questions strangely.
For instance, if you're asked what year it is, you might respond with, "the year of the snake" or such an answer. Your goal is to make it difficult for the tester to get a bead on what a "normal" response is for you. Think of something mentally stressful when answering a control question. For instance, you might try doing mental arithmetic when a control question is asked.
Count backwards by 7s in your head as quickly as possible or do some quick long division. This will help change your blood pressure and heart rate to a level that's similar to that which occurs during actual stressful situations - like answering a revealing question.
Alternatively, you can mentally picture a frightening scenario, like, for instance, drowning, as this typically will also increase your heart rate and breathing. Handle the post-test interview. This is a trick. Remain calm and firmly but politely repeat your denial. Method 2. Remember that the polygrapher is not your friend. Beware of pretest tricks.
Polygraphers will frequently attempt to instill fear in the subject or convince the subject of the accuracy of the polygraph machine. So here's how you beat the test: Change your heart rate , respiratory rate, blood pressure and sweat level while answering control questions. Send your control lies off the charts. By comparison, your answers to the relevant questions whether they are truths or falsehoods will seem true.
As seen in the film "Ocean's Eleven", one method of ramping up your vital signs when answering control questions is to press down on a thumbtack, or some other sharp object, in your shoe. The pain from doing this will cause most of your vitals to spike, and your response will probably be read as a lie.
So you'll need a back-up plan. The authors suggest thinking exciting or scary thoughts when you recognize a control question. George Maschke, who has run antipolygraph. Goodson says that although he can successfully defeat a polygraph against novice students, defeating an experienced examiner is harder. Polygraph evidence is generally not admissible in court Credit: SPL.
Some researchers are also concerned that when wrong, the tests produce more false positives meaning innocent people who wrongly fail than false negatives meaning guilty people who wrongly pass , a phenomenon that can be seen in a report on the validity of polygraphs by the British Psychological Society.
Many scientists are concerned that the theory behind lie detectors is faulty, since a physiological response is not necessarily linked to lying. The pace of your heartbeat changes if you're faced with a mentally taxing task Credit: SPL. An examiner presents a potential suspect with specific information unrelated and related to a crime to test whether examinees have a response to the relevant items.
Take a bank robbery for instance. You could present the amount of money that was stolen from the bank among other figures, or a genuine ransom note that was passed to the bank teller among other notes created by the police.
Far from perfect — but still, it caught me out. I failed spectacularly. Quicken your breathing during control questions, but breathe again normally before answering the next question.
Calm yourself before answering by imagining anything you find relaxing. Do not explain answers, give details, or offer explanations. Lie in response to control questions, but also bite your tongue hard while doing so, which will set off other physiological reactions in the body. Log In.
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