It might be the cheeks flushing with embarrassment or the voice choking with emotion.
Our physical reactions can reveal what we truly feel.
and some think they can show when someone is lying.
Typically when a person tells a lie, they begin to sweat.
I¡¯m sure we¡¯ve all seen the 1940s or 50s interrogation movies where
The person in the hot seat has sweaty brow or a sweaty upper-lip or
Perhaps sweats trickle down from their side bones.
Jack uses physical sensations to probe for truth.
His primary tool, the lie detector or polygraph.
Polygraph works very similar to any other bio-feedback instrument
It simply records deviations from a person¡¯s physiological normal
Such as someone¡¯s blood pressure going up and then coming back down
Or perhaps a decrease or increase in the pulse rate
Or sweat gland activity
A polygraph examiner knows what to look for when questioning someone.
Any deviation from normal could signal deception.
Our body can give us away.
We may think we are being cool
But when we are stressed
Our network of nerves start to prepare our body for action
As if it¡¯s under attack.
It¡¯s a response that harks back (»ØÏë)to our ancient ancestors.
Fight or flight?
It starts by triggering your stress hormone and adrenaline
Your heart rate increases to pump more blood to your muscles
As if you are about to go into battle
Your breathing deepens
As vital oxygen reaches your muscles
And you begin to sweat
The body cools so that
You won't overheat when rushing into action
The brain won¡¯t let us stop the survival strategy
These basic nerve functions are automatic
That¡¯s why a polygraph can often uncover a liar