Lie detection is a hotly debated area of modern day
psychology. Although it is not an exact science, there are techniques and
methods that allow experts to judge if someone is telling the truth or not.
Polygraph tests go some way in detecting lies, but they are not always
available or feasible for every case. Instead investigators use a number of
observational methods to establish whether someone is lying, including facial
expressions and body language.
Micro
expressions
It is widely accepted that faces exhibit two
messages – what the liar wants to show and what they want to hide. Micro
expressions refer to these brief, involuntary facial expressions that reveal
their true emotions. This flash of leakage is there and gone in a matter of
nanoseconds, so you have to be quick to catch it. Whilst this cannot prove
guilt or deception, the behaviour does indicate dishonesty and warrants further
investigation.
False
expressions
Tied to this notion of micro expressions is the
subject of false expressions. These nonverbal behaviours are forced or
exaggerated to conceal true emotions, and research has shown that these faked
expressions are asymmetrical.
For example, smiling may indicate a false expression
when the eye muscles are not used. A genuine smile involves the movement of the
outer part of the eye, so no matter how big the grin may be, a lack of eye
expression may be the telling sign. If someone is afraid or sad, the absence of
forehead expression hints that they are falsifying their emotions.
By studying the symmetry of a suspect’s face,
experts may be able to detect a liar from a truthteller.
Body language
Studies have suggested that liars often gesticulate
with their hands after they talk. This is because their brain is so preoccupied
with making up and remembering a story, meaning that hand gestures that might
normally appear before a statement happen afterwards instead.
Fidgeting is a common sign of lying. Twitching,
shuffling feet and clasping hands are behaviours that may indicate guilt or
deception due to fluctuations in the autonomic nervous system. This system
regulates bodily functions, and when people are nervous it may manifest itself
in fluctuations that cause itches or tingles in the body.
Sweating
It’s an exaggerated image we’ve all seen in movies
and TV when a suspect is being questioned – sweat dripping from every pore in
their body. Whilst it may not be this extreme, it is true that lying suspects
sweat more due to automatic nervous system changes. If you notice someone’s
forehead or upper lip perspiring, it could be a sign of deception.
To find out more about how we catch liars and get to
the truth, get in touch with ICFECI today.
Resource: https://www.icfeci.com/lie-detection/
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