How to spot a liar: forget body language, these questions reveal much more

Forget fidgeting and eye contact; experts argue that the common methods for detecting lies are fundamentally flawed. According to psychologists, the focus on body language, such as nose-scratching or ear-touching, is a misdirection. The real indicators of deception lie not in physical tells, but in what people say and how they say it.

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If you are telling a lie that has a lot at stake, you will usually have rehearsed it – you will have thought about it, you try to remember what you said in case you are asked again, so you can repeat the same thing.

Dr. Sharon Lil, a psychologist specializing in deception detection at the University of Portsmouth, explains that lying, especially when stakes are high, often involves extensive rehearsal. Liars meticulously craft and memorize their stories to maintain consistency. This mental effort, coupled with the need to suppress the truth and monitor their own behavior and the reactions of their interrogator, creates a significant cognitive load. This mental strain, she notes, is not always visible through physical cues.

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We know from fMRI scans that the truth comes up first in the brain and then it has to be suppressed, so all of that adds to the cognitive load.

Research indicates that the cognitive burden of lying can manifest more effectively through verbal signs. While popular culture often emphasizes non-verbal cues, scientific evidence supporting their reliability in lie detection is scarce. In fact, liars may appear calmer than truthful individuals, as they are actively trying to control their outward appearance. The key, according to experts, is to listen closely to the words spoken and the way they are delivered.

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We now know that detecting lies based on verbal cues is much more effective than based on non-verbal cues, although we hear much more about non-verbal cues.

Psychologists advocate for a technique called Strategic Use of Evidence (SUE). This method involves an interrogator asking questions about a specific event without revealing the information they already possess. Truthful individuals tend to speak freely and offer details, whereas liars may deny involvement, hesitate to provide specifics, or attempt to evade questions. If interrogators lack sufficient evidence, they can prompt the suspect to provide it, which can further reveal inconsistencies and deception.

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There is no scientific evidence that looking for non-verbal cues actually works. Forget about extraneous movements, fidgeting, blinking, avoiding eye contact – that is simply not there.