Detecting a  lie  isn't always easy. People often pay attention to signs like eye contact, nervous gestures, or tone of voice, but the reality is that these indicators can be unreliable. Some people may appear calm while lying, while others seem nervous even when telling the truth. For this reason, various  behavioral psychology specialists  suggest paying more attention to the  questions being asked  than to the other person's gestures.

In recent years, researchers and experts in  communication and language  have pointed out that certain strategic questions can significantly increase the likelihood of detecting inconsistencies in someone's story. In fact, there is a simple technique based on  two key questions  that help reveal contradictions when a person isn't telling the whole truth.

To catch a liar, just ask them these two questions: the psychological technique that reveals contradictions

The first question some specialists recommend is asking the person to  repeat the story, but in reverse order . For example, if someone recounts what happened during a particular situation, they can be asked to describe the events starting from the end and working backward step by step.

This strategy works because those who tell the truth tend to remember the actual events more easily, even when they change the order of the narrative. In contrast, those who have invented a story may have difficulty rearranging the events, since the account is not based on real memories but on an improvised construction.

When attempting to reconstruct the story in reverse,  cognitive effort increases , which can lead to longer pauses, contradictions, or gaps in the narrative. These inconsistencies don't automatically prove that someone is lying, but they can indicate that the story needs to be analyzed more closely.

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To catch a liar, just ask them these two questions: the psychological technique that reveals contradictions

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Another interesting aspect is that those who tell the truth tend to  naturally offer additional information , while those who fabricate a story may limit themselves to answering only the bare minimum to avoid mistakes. This difference in narrative style can become an important clue for evaluating the credibility of an explanation.

Behavioral analysis experts   point out that these two questions work because they increase what's called  cognitive load —the mental effort required to maintain a lie. The greater this load, the more likely inconsistencies are to appear in the story.

However, they also caution that  no method guarantees detecting a lie with absolute certainty . Factors such as stress, nervousness, or differences in memory can influence how a person answers questions, even when they are telling the truth.