One of the foundational skills of NLP that you begin to hone in NLP Practitioner training (and beyond) is that of pattern detection. Once your sensory acuity sharpens, you can start to apply your new pattern detection skills in a variety of ways.

One of them is in identifying when someone is lying.

A person’s mouth is just one thing to watch when someone might be lying. Whether it’s a subtle covering of the mouth while making a statement, swallowing or gulping at a seemingly inappropriate time, or an inappropriate smile or facial express, all are used to calibrate against a lie.

These tiny physiological signals involving the mouth, often unperceived because they occur so quickly and seem natural, are at times what can be called unconscious “micro-signals.”

Throat clearing in response to a question or statement usually signified disagreement to something that is said or asked, or an uncomfortableness with an unprepared answer to follow.

Gulping is usually a sign of nervousness, which should lead you to question the reason or source for that nervousness.

One of the more obvious signals (but most often overlooked) is when someone tries to cover up their words. Literally. A person will cover their mouth with his or her hand as if scratching or yawning. If someone finds an excuse to rub their lips, scratch their mouth or nose, run an index finger under their nose, or in some other way cause their hand to come between lips and face, it’s typically an outright lie being spoken.

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