Vibration
Vibration exists in all living things. If there is no vibration, the organism is dead. Vibration varies of course in amplitude, rate and traveling characteristics. There is an inverse relationship between character armoring and vibration. Vibration varies with changes in the organism, including emotional. For humans this is captured in the phrase "giving off a vibe." generally, the more a person vibrates, the happier others are to have him or her around. Tics and fidgeting are not vibratory phenomenon but rather volitionally oriented attempts to relieve muscle tension in a the absence of much vibration. Neither tense shortened muscles or flaccid over-lengthened muscles are conducive to vibration.
Hallucinogens are known for increasing the perception of vibration, but this effects decays with habituation and also is accompanied by an emotional dissociation that blunts the impact.
Functionally vibration and pulsation are similar. Generally the word vibration suggests movement back and forth around a fixed point, while pulsation suggests a wave movement outward from a point. In part this is an artifact of the observer because many waves, such as the pulse of blood generated by the heart, return to the source.
Sound is an important source of vibration. Humans have the ability to generate sound deliberately and creatively. Singing has long been a communal activity that connects people and raises the life force. Mothers instinctively sing to babies. The late Alfred Tomatis demonstrated the relationship between sound, hearing, and well-being.
Attunement
Attunement is an idea from the world of sound, or audible vibration. Attunement between two people implies that they are both vibrating, and that each's vibration influences or changes to match the vibration of the other. It is very hard for someone with a low energy level or low motility to attune with any one. Sound and voice play an important role in attunement.