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Experts explain how lie detectors work, what happens in the brain when we tell lies and how accurate polygraph tests are.
- In a 2002 study, 60% of people were found to lie at least once during a 10-minute conversation, with most people telling an average of two or three lies. The polygraph, invented in the early 1920s, detects physiological responses to lying (such as elevated heart and respiratory rates as well as spiked in blood pressure.
- Three main areas of the brain are stimulated during deception - the frontal lobe, the limbic system, and the temporal lobe.
- According to the American Polygraph Association (made up largely of polygraph examiners), the estimated accuracy of a polygraph can be up to 87%.
What happens in your brain when you lie?<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDU5ODY0Ny9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY2NDU4OTUzMX0.GHs9ZTFWtuC8IGBQTLsM4qd2LFriJZFuAn4whFj-GZ0/img.jpg?width=1245&coordinates=0%2C19%2C0%2C101&height=700" id="c3d06" class="rm-shortcode" data-rm-shortcode-id="fca6b5602584de3d4cf9b539645ceb67" data-rm-shortcode-name="rebelmouse-image" alt="concept of lying polygraph test what happens in your brain when you lie" />
What happens in the brain when you lie?
Image by Shidlovski on Shutterstock<p>We all lie. Some might argue it's human nature. In a 2002 study, 60% of people were found to lie at least once during a 10-minute conversation, with most people telling an average of two or three lies. Some lies are small, some are bigger, some done out of kindness and some done out of malice - but a lie is a lie, and the way that your body reacts when you lie is the same.</p> <p><strong>Lying is an inherently stressful activity. </strong></p><p>When you engage in a false narrative (or a lie), your respiratory and heart rate will increase and you may even start to sweat. While people may vary in the ability to tell a lie, most of the time your body will react in this same way. Exceptions to this rule are, for example, psychopaths, who lack empathy and therefore do not exhibit the typical physiological stress responses when telling a lie. </p> <p><strong>Brain imaging studies have shown what really happens in the brain when you tell a lie. </strong></p><p>Lying generally involves more effort than telling the truth, and because of this, it involves the prefrontal cortex. <a href="https://www.scientificamerican.com/article/the-art-of-lying/" target="_blank" rel="noopener noreferrer">A 2001 study</a> by late neuroscientist Sean Spence (University of Sheffield in England) explored fMRI images of the brain while lying. Participants answered questions about their daily routine by pressing a yes or no button on a screen. Depending on the color of the writing, they were to answer either truthfully or with a lie. </p> <p>The results showed participants needed more time to formulate a dishonest answer than an honest one, and certain parts of the prefrontal cortex were more active when they were lying. </p> <p><a href="https://mashable.com/2013/12/20/psychology-of-lying/?europe=true#:~:text=When%20we%20lie%2C%20it%20stimulates,memories%20and%20creating%20mental%20imagery." target="_blank" rel="noopener noreferrer">Further research</a> explains that three main areas of the brain are stimulated during deception - the frontal lobe works to suppress the truth, the limbic system activates due to the anxiety that comes from lying and the temporal lobe activates in response to retrieving memories and creating mental imagery (fabricating a believable lie). </p> <p><strong>Research also suggests lying becomes easier the more you do it. </strong></p><p><a href="https://pubmed.ncbi.nlm.nih.gov/27775721/" target="_blank" rel="noopener noreferrer">In a 2016 study</a>, Duke psychologist Dan Ariely and his colleagues showed how dishonest can alter your brain, making it easier to tell lies in the future. When people told lies, the scientists noticed a burst of activity in the amygdala (the part of the brain involved in fear, anxiety, and emotional responses such as guilt over telling a lie). When the scientists had their subject play a game in which they won money by deceiving their partner, they notice the negative signals from the amygdala begin to decrease. </p> <p>"Lying, in fact, desensitized your brain to the fear of getting caught of hurting others, making lying for your own benefit down the road much easier." - <a href="https://www.inc.com/jessica-stillman/the-science-of-lying-more-you-do-it-easier-it-gets.html" target="_blank" rel="noopener noreferrer">INC</a></p>
How do lie detectors work?<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDU5ODY3MS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzNzg5MDU0OX0._xLKh6Lu15CNNf0eoLNROD6XGuqiT2R8pKxq0TECV2A/img.jpg?width=1245&coordinates=0%2C193%2C0%2C1994&height=700" id="db217" class="rm-shortcode" data-rm-shortcode-id="ed1b9bb084bc4eb03b97b62bf08bd4c0" data-rm-shortcode-name="rebelmouse-image" alt="concept of polygraph lie detector test how do polygraphs work" />
Typically, in 87/100 cases, the polygraph will be able to detect if someone is telling the truth.
Image by OllivsArt on Shutterstock<p>In 1921, a California-based police officer and physiologist John A. Larson created an apparatus that simultaneously measures continuous changes in blood pressure, heart rate, and respiration rate to aid in the detection of deception. This was the invention of the polygraph, which is commonly referred to as a lie detector.</p> <p>Seven years before this, in 1914, an Italian psychologist (Vittorio Benussi) published findings on "the respiratory symptoms of a lie", and in 1915, an American psychologist and lawyer (William M. Marston) invented a blood pressure test for the detection of deception.</p><p>"The polygraph is designed to detect those subtle changes in a person's physiological responses when they lie." - <a href="https://www.psychologytoday.com/us/blog/the-nature-deception/202001/do-lie-detector-tests-really-work#:~:text=It%20does%20work%20much%20of,trained%20polygraph%20examiner%20can%20tell.&text=They%20estimate%20the%20accuracy%20of,lying%20or%20telling%20the%20truth" target="_blank" rel="noopener noreferrer">Psychology Today</a></p> <p>The accuracy of polygraph tests has been called into question for nearly as long as they've existed - but here's the truth about lie detectors: they detect typical stress responses to telling a lie. This means increased heart rate, blood pressure, and respiration rate. Some people are naturally good liars (or become better with controlling these stress responses) and can manage to stay calm during a lie detector test. </p> <p><a href="https://www.psychologytoday.com/us/blog/the-nature-deception/202001/do-lie-detector-tests-really-work#:~:text=It%20does%20work%20much%20of,trained%20polygraph%20examiner%20can%20tell.&text=They%20estimate%20the%20accuracy%20of,lying%20or%20telling%20the%20truth" target="_blank" rel="noopener noreferrer">According to the American Polygraph Association</a> (made up largely of polygraph examiners), the estimated accuracy of a polygraph can be up to 87%. Typically, in 87/100 cases, the polygraph will be able to detect if someone is telling the truth.</p> <p>If the person lies but doesn't have the stress symptoms of telling that lie, they will pass the test. Similarly, innocent people may fail the test due to being anxious about taking it to begin with and therefore emitting the elevated heart, respiratory, and blood pressure rates that can be detected. </p>
Erin Meyer explains the keeper test and how it can make or break a team.
- There are numerous strategies for building and maintaining a high-performing team, but unfortunately they are not plug-and-play. What works for some companies will not necessarily work for others. Erin Meyer, co-author of No Rules Rules: Netflix and the Culture of Reinvention, shares one alternative employed by one of the largest tech and media services companies in the world.
- Instead of the 'Rank and Yank' method once used by GE, Meyer explains how Netflix managers use the 'keeper test' to determine if employees are crucial pieces of the larger team and are worth fighting to keep.
- "An individual performance problem is a systemic problem that impacts the entire team," she says. This is a valuable lesson that could determine whether the team fails or whether an organization advances to the next level.
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