How to identify a person
weather he/she is telling true or not?
Better lie
detector
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Identifying the lies is pretty
difficult task. Many of the articles says how to detect the lies they are not
good enough.
I've read and heard all kinds of rubbish about how to detect
lies. Apparently you should look for sweating, which way people's eyes move,
whether they make too much eye contact or too little...and so on.
Ironically advice to look for individual 'tells', like a poker
player is supposed to, is a mug's game.
Certainly
under laboratory conditions people are very poor at detecting when other people
are lying. Across 206 studies people's hit rates for detecting lies was 54%,
which seeing as you'd get 50% right by pure chance is not very impressive (Bond & DePaulo, 2006).
So, why
is it so difficult to tell when people are lying? That's what Hartwig & Bond (2011) examine in a meta-analysis of dozens
of studies. They looked at all kinds of different cues to lying like fidgeting,
postural shifts, head movements, gaze aversion and speech rate.
What they found is that overall people do pay attention to many
of the correct cues to lying. These include things like:
§ Vocal immediacy, i.e. the extent to
which someone replies directly to questions. The vaguer someone is, the more
likely they are to be lying.
§ Indifference: if the speaker
seems unconcerned then this is associated with lying. It's probably because they're
trying to play it cool.
§ Thinking hard: lying is hard work
so when a person has to think hard about a question, it might indicate they are
lying.
§ Being uncooperative: pretty obvious,
but still being uncooperative is often a cue that someone is trying to conceal
something.
Although people are generally good, they do overestimate the power of some cues,
for example looking away is not a good cue to deception and neither is
fidgeting with an object.
But if overall people seem to know what the right cues to lying
are, why aren't they better at detecting them?
What the research suggests is that although people generally use
the right cues, the cues themselves are very ambiguous. In other words: usually
there just isn't enough information to go on.
Have another look at some of the apparently effective lying
tells above and think of alternative explanations. For example, someone who is
just tired might appear uncooperative, or they might look indifferent because
they genuinely don't care and they might think hard because they want to tell
the truth as accurately as possible.
Away from the specifics of lying for a moment, we're all used to
how hard it is to read other people's thoughts and feelings. Body language is
ambiguous and anyone who tells you different is trying to sell you a system
that doesn't work.
Better lie
detector
Given all that, how do you become a better lie detector? The
answer is that (unfortunately) there's no one magic bullet to detecting lies because lying tells are
too weak.
One
method for improving the odds is to try and increase the cues given off by
suspected liars by putting more pressure on them. Short of waterboarding, one
way of doing this is putting them under cognitive load. For example
interrogators will get a suspect to tell their story backwards. A study has
shown that lie catchers do a better job when people try to tell their story
backwards (Vrij
et al., 2008).
However these sorts of tricks only increase the chances of
detecting lies from almost impossible to just very, very difficult.
The best advice is to rely on your instincts. Overall, in the
studies, people do better at detecting lies if they rely on their instincts
rather than specific tells.
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