Adaptor: A nervous or self-soothing movement like rubbing your fingers together or stroking your neck. A person who may be uncomfortable about asking or answering a question might use an adaptor. It's a sign of stress.
Barrier: Using a body part or object to put separation between you and another person. The proverbial “cold shoulder” is a barrier. It suggests stress is present.
Baseline: The basis for comparison between what is customary and what is a deviation from customary when observing or listening to someone's response to a question. A person who is usually calm but has a sudden change in voice or movement in responding to a question is deviating from baseline. It's a sign of stress.
Batoning: Using a body part, generally an arm, ...