We all are aware that emotional states can effect health. Stress is acknowledged to cause backaches and ulcers. Shamans believe that your emotion takes the form of energy and can be stored throughout the body and eventually lead to illness. So you store your stress or anger in your stomach, or you get angry and send your anger out at someone. We can see this if can remember a time when someone's anger or sadness seemed to have an effect on a room: "her anger hit me like a blow" "you could cut the tension with a knife."
In the case of shamanic extraction they are working with misplaced energy. No energy is truly bad from a shamanic perspective. If energy is misplaced or it isn't in accord with the environment (the human body, or the body of land...) it will bring illness.
The energy that can be stored in the body does not have to be from anger but could be from other reasons as well. In the shamanic mind there is no distinction made based on where the energy came from. The shaman sees that the energy does not belong there and removes it.
Research paleoanthropologist Hank Wesselman is one of those rare cutting edge scientists who truly walks between the worlds. In his explorations of these inner worlds, Hank may have also provided us with a glimpse into the possible evolutionary future of humanity.