Many people – from parents to police officers and airport security personnel – depend on this method. But does a person’s body and face reveal the truth?
Not according to a new study.
Talking, it seems, is the best way to smoke out a liar. That is what researchers in the United Kingdom found out recently. Their investigation took place at one place where lying can get you into big trouble – an airport.
The researchers asked volunteers to pretend they were real passengers and then lie to airport security agents. Some of the agents used spoken conversation-based methods to question these make-believe passengers. Others depended instead on the person’s body language, like lack of eye contact and showing signs of nervousness.
The agents talking with the passengers were 20 times more likely to catch the liars. The study found that these conversation-based techniques can help you recognize when a person is lying to you.
Like many methods, this conversation method has a name. It is called Controlled Cognitive Engagement or CCE, for short.
The British government partly financed this study. The American Psychological Association published the findings.
Body language cannot be trusted
Using body language and facial expressions to catch someone in a lie is really hard. And it only works, seemingly, by chance.
Thomas Ormerod is the head of the School of Psychology at the University of Sussex in England. On the APA website, he reported that the “suspicious-signs method” -- or using body language – “almost completely fails” in finding lies.
In the conversational CCE method, security agents just talk with passengers. They ask about informal things as you would in a normal conversation. While talking, the agents might ask questions about topics that are seemingly unrelated. Then the agent observes if the person becomes more evasive or erratic. They also observe is their way of speaking changes.
In an article on the APA website, Ormerod says that for actual passengers, they are “just chatting about themselves. It shouldn’t feel like an interrogation.”