While we may associate nervousness with fidgeting or shakiness, Glass explains that you should be just as wary of those who do not move at all. She elaborates by claiming this may be related to the human ‘fight or flight’ instinct, specifically the option to ‘fight’. As a result of this instinct, the body tenses itself in preparation for potential confrontation.
When engaging in regular discussion, humans usually move casually, subtly relaxing, swaying or experiencing unconscious movements. Therefore, someone with a rigid demeanor is emitting a warning that something isn’t quite right.
Repetitiveness may occur when someone is trying to convince you of their point, in an attempt to ‘drill it in’ to your mind. This is a good way to go if you are wondering how to tell if someone is lying. They may also be trying to reassure themselves that the lie could be considered true. Glass uses the example of a person repeating the phrase ‘I didn’t’, as if this will somehow excuse them from the responsibility of their supposed action.
It is also a technique used by liars to buy time to create a more elaborate story.
Liars will often over-compensate by providing too much information. When a person reels off an elaborate tale that may not even have been requested, it’s a clear sign they are trying to convince you their story is true. Glass suggests that by openly talking, others will believe what they have to say.