The big pause: Lying is quite a complex process for the body and brain to deal with. First your brain produces the truth which it then has to suppress before inventing the lie and the performance of that lie.
This often leads to a longer pause than normal before answering, plus a verbal stalling technique like ‘Why do you ask that?’ rather than a direct and open response.
The eye dart: Humans have more eye expressions than any other animal and our eyes can give away if we’re trying to hide something.
When we look up to our left to think we’re often accessing recalled memory, but when our eyes roll up to our right we can be thinking more creatively. Also, the guilt of a lie often makes people use an eye contact cut-off gesture, such as looking down or away.
The lost breath: Bending the truth causes an instant stress response in most people, meaning the fight or flight mechanisms are activated.
The mouth dries, the body sweats more, the pulse rate quickens and the rhythm of the breathing changes to shorter, shallower breaths that can often be both seen and heard.
Overcompensating: A liar will often over-perform, both speaking and gesticulating too much in a bid to be more convincing.
