With major splits during severe trauma, sometimes a person's part that is soul will split and be joined to a piece of the person’s spirit. These fragments are particularly good at operating autonomously, both inside and outside of the person’s body. These types of alters will be very significant and strong. In a crisis moment, this type of alter can even replace the part of the person that was formerly responsible for living life.
For more information - Understanding SRA/DID - Bride Ministries International