Want to spot a liar? Body language is not the key

If liars' noses grew like Pinocchio's every time they lied, it would be much easier to catch them. But there are that help you to know if someone is lying or not.

It is said that you can spot a liar, no matter how clever, by his body language. His hands sweat, his pulse quickens, his cheeks or nose turn red, or he looks away, avoiding eye contact. It's nothing we haven't seen before in hundreds of CSI episodes. But it doesn't always work. A truth teller may become nervous for other reasons and exhibit the same nonverbal symptoms as a liar when telling a lie.

There are even liars who have so internalized this skill that the physical signs are minimized. However, as explained by The Conversation Many studies have tried to show that it is easier to catch a liar by what they say and how they say it. This may seem difficult at first – after all, liars are experts at turning falsehoods into truths – but they can be caught.

Honest people believe in the truth and are convinced that it always prevails, that an investigator in an interrogation will believe them. They even forget to give important details because they think they are irrelevant to their argument if the truth is obvious. However, the first Achilles heel of the liar is that he is very concerned about his credibility and being able to claim that his story is true.

Liars simplify their stories

The liar strives to tell simple stories because they are easier to remember. They fear that what they say will arouse the doubts of the interviewer and that the interviewer will seek to verify the facts. They also fear that they will not be able to repeat everything they said the first time, which requires a lot of thought and memory.

It is easier to detect a lie by listening to someone talk than by observing them.

A study by the Department of Psychology at the University of Portsmouthin the United Kingdom showed that “verbal cues are more revealing than nonverbal cues” and that “people detect lies better when they listen to someone talk than when they observe their behavior.

In addition, police investigators use different strategies to unmask liars. Strategic use of evidence involves using hard evidence to corner a liar into revealing his or her lie. A liar will avoid giving more information, deny the facts and dodge questions. Conversely, if the person is honest and has nothing to hide, they will be cooperative and open.

Another technique used by investigators is information verification. This involves asking a suspect if they can provide evidence to support their case. An honest person will go to great lengths to cooperate, while a liar will have no argument to help the investigation. Eavesdropping is very revealing and, although not as sophisticated as the polygraph, it is crucial to finding out what the other person is thinking or making up.