What is looked at in the video the amygdala volumes, pituitary gland, lobe, hippocampus etc, if you google the parts of the brain they help the body do so many things....If it was diagnosable that way sure would help. If you read the research papers on the topic it makes plenty of sense. Basically there is more going on there rewired plural, than normal so until you can get increased communication with alters the inner world it will make better sense...It is my understanding some people have it some people don't...Not sure if it is required, but it will come out of your mouth some at certain times some at other times. What, their names, ages, created, emerged,created for then you have to work on consciousness with other alters in the system etc