Researchers Reveal Why Liars Keep Lying

Researchers Reveal Why Liars Keep Lying



The intentional telling of untruths commonly referred to as ‘lying,’ is something that most people – if not all people – are guilty of. Dishonesty is an inherent part of life in society, and adversely influences a number of areas – both large and small; both individually and collectively. We can all pretty much agree on these points about liars.

Something that we’re all likely in agreement on some people lie more than others. In some cases, much more than others. Perhaps we’ve all known or been acquainted with someone with a propensity for telling untruths. Such individuals are ‘compulsive liars,” as their ability to manipulate the truth seems to have to boundaries.


This Is Why Liars Keep Lying

Behaviorally, we show that the extent to which participants engage in self-serving dishonestly increases with repetition. Using functional MRI, we show that signal reduction in the amygdala is sensitive to the history of dishonest behavior, consistent with adaptation. – Garrett, N. et. al, “The brain adapts to dishonesty”

Why do liars keep on lying? Even in cases where they fully comprehend the pain that lying inflicts, why do people compulsively engage in dishonesty? Is it a choice? Is there something wrong with their brain?

To shine some light on the complex matter of compulsive lying, a team of researchers at University College London (UCL) engineered a fascinating experiment.

phrases of a liar

The Study on Why Liars Are Always Lying

The rationale given for the study, published in the journal Nature Neuroscience:

From financial fraud to plagiarism, online scams and scientific misconduct, deceivers retrospectively describe how minor dishonest decisions snowballed into significant ones over time. Despite the dramatic impact of these acts on economics, policy and education, we do not have a clear understanding of how and why small transgressions may gradually lead to larger ones.


In simple terms: the team wanted to know why lying not only appears to increase frequency, but in scope.

The researchers decided to recruit 80 participants and monitor their brain activity using a Functional magnetic resonance imaging (fMRI) machine. However, the team recognized the inherent difficulty in observing deception using brain scans, as “participants need to repeatedly, deliberately and voluntarily act dishonestly in a social context without being required to admit their dishonesty.”

To work around these difficulties, the team devised a creative experimental model, whereby they were able to observe and quantify deception using a trial-by-trial method. Specifically, the team created a two-party experiment.

Each person advised their “partner” on the amount of money contained in a glass jar with pennies. Importantly, there were incentives serving as the motivation to deceive. Over the course of the experiments, the incentive model was altered, so that the money would benefit or harm one of the two partners. In every case, the participant was required to lie in order to benefit themself.

The team conducted two experiments:

Experiment #1: Both the participant and partner benefit if participant lies; only participant benefits if they lie; or partner benefits.


Experiment #2: Either the participant or partner benefits, excluding either/or if the participant lies.

Experiment Results

We observed clear evidence of escalation in self-serving dishonestly (participant only benefits), such that the magnitude of dishonesty got larger and larger…

The ‘magnitude’ of dishonesty escalated with self-serving incentives, as opposed to self-harming (partner benefits, affecting the participant). In other words, the majority of the 80 people were much more likely to lie when the circumstances benefitted only themselves, while completely disregarding their partner’s stake.

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