We all were probably taught to never lie but there would be rarely anyone who can truthfully claim that he or she doesn’t lie or hasn’t lied in life, ever. Depending upon the demands of the situation, we might tell a lie for harmless reasons like to avoid awkward situations, protect others, or avoid hurting others’ feelings, or, for some other reasons that are much serious and can potentially wreak havoc on our lives. However, there are some people who lie out of habit. And, the more they lie, the easier and more frequent this behaviour becomes. Scientists have now discovered why liars lie.

Psychologists believe that children start lying at the age of two. Since lying involves paying attention to the environment, complex planning, and the ability to manipulate a situation, it is actually considered a crucial milestone in children’s development. While growing up, they keep on learning how to use this skill for their own benefit, and by the time they reach adulthood, their lies become much more clever, harder to catch, and easier to get away with.

Cognitive neuroscientist Joshua Greene from Harvard University investigated the physical process of lying during an experiment. Participants were given the opportunity to win money by lying. While some of them still stuck to being honest and told the truth, others resorted to deception. The MRI of the participants was performed to examine their brain activity during the study. The MRI reports revealed that there was an increased activity in the frontal parietal control network of the group of liars because deciding between honesty and lying requires hard and intricate thinking. Since the neural reward centers of the participants who won money by telling lies were more active, it can be assumed that lying may be a result of the inability to resist temptation.

However, there is still no scientific explanation as to why people tend to avoid lying and whether it is a result of conflict in their brains or an understanding of morality and self-control, or simply following the social norm. According to Dan Ariely, a behavioral psychologist at Duke, “We are our own judge about our own honesty. And that internal judge is what differentiates psychopaths and non-psychopaths.”

Apparently, despite that the urge to lie comes from within, external factors can influence the frequency too. Research has shown that people tend to be dishonest when they are suffering from stress or lack of sleep, or when they see others lying. “We as a society need to understand that when we don’t punish lying, we increase the probability it will happen again,” Ariely added.

Ariely and his colleagues conducted a study to show the change in participants’ brain while they are being dishonest. The study revealed that there was an increased activity in their amygdala, a part of the brain responsible for producing fear, anxiety and emotions. This change made lying or being dishonest easier for those participants. The signals from the amygdala reduced when they expected no consequences for being dishonest, such as when playing a game. Cognitive neuroscientist at University College London, Tali Sharot, who led the research said, “If you give people multiple opportunities to lie for their own benefit, they start with little lies and get bigger and bigger over time.”

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