Glass describes heavy breathing as a ‘reflex action’, commonly associated with lying. If you’re not close enough to hear or feel the individual’s breath, watch their shoulders, which will rise and listen to their voice, which may become shallow, unclear or cracked. Essentially, the person is experiencing breathlessness due to their increased heart rate and changes in their blood flow, which is caused by the pressure of lying. This also occurs when humans are nervous or tense.
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.