The brain can be thought of like a computer in which many programs have been written and stored.  Sometimes software contains a "glitch" or sometimes the software can become outdated.  Hypnosis then can be thought of  as "replacing an existing belief in the conscious mind with a new, upgraded, and improved one......(or as) a software patch......The patch being built independently of the original software (old unwanted habit) and inserted at a later time to upgrade the program and "heal" it from unwanted responses."  The Spontaneous Healing of Belief, Braden, pg. 164

Science behind hypnosis:  "Each time an electrochemical impulse flows through a network of neurons, those connections are strengthened, making it more likely that that pathway will be used again.  With new ways of thinking and behaving, new connections between cells are established, and others used less often selectively die off or are "pruned"."  (UAMS College of Medicine, Dept. of Psychiatry's Partners in Behavioral Health Sciences, lesson 5)