To make things simple, we can divide body perceptions into Visual, Auditory, and Kinesthetic. I.e. pictures, sounds, and feelings. That is not only what the person mostly takes in in the present, it is also mostly what she has stored in her mind. Most of what you find in the mind is made out of some sort of combination of pictures, sounds, and feelings. When the person accesses an item in her mind her body will tend to reflect what kind of information it is, if it predominantly has pictures, sounds, or feelings.
Feeling has a low frequency, it is slow and deep.
Auditory has a higher frequency, it is faster, more mobile. Visual is high frequency, fast and changeable. These qualities show in various ways in the body. A person will breathe shallowly and high in the chest when accessing visual information. She will breathe deeply and slowly when accessing kinesthetic information.