It is the mind giving false information to its observers. It is important to understand this concept, because a Belief System is not deception.
The mind and the body have to agree in order for the body to sing/dance.
The reasons a body gives a deceiver away is because of emotions and the chemicals they dump into the body. A few examples, fear, joy, love, hate, jealousy, ect…
Turn off emotion and deception is done with out stress. But now the mind has to mimic natural flow and it will always be a portrayal.