The hypnotist uses words and phrases that cause a false anxiety in the mind, triggering the flight mechanism, which temporarily causes the critical mind area to silence (enter abeyance), allowing communication between/with the conscious and subconscious.
As animals evolved they developed an increased ability for either "fight' or "flight". Those that did neither became extinct. Mankind also developed these abilities (both) along with the capacity to think after his physical reaction of fight or flight. Along with these abilities we also developed expanded inhibitory processes such as needs for: clothing for modesty, grouping into communities for protection and companionship, rules of social communal conduct followed by independent living within confined areas, bartering, fair trade, expeditions, religion, war, ethics and so on.
"The inhibitory process further developed into an automatic compensating system called the parasympathetic nervous system". When the sympathetic nervous system prepares for either fight or flight the parasympathetic system regulates us back to normal. As fight became less socially acceptable the parasympathetic system suppressed the fight reaction allowing the flight to become a more prevalent and acceptable escape mechanism.
As greater consciousness develops and inhibitions are learned, anxieties develop as we realize we cannot go back into our earlier primitive mind. Since we learn to suppress fight, flight becomes our usual escape under high anxiety or stress.
This allows direct communication to the subconscious through the conscious as well as a heightened awareness as two minds are now in participation with the "hypnotic guide". While one mind (subconscious) is doing the actual work the other mind (conscious) observes the interactions and is still fully capable of accepting or rejecting the work as it progresses. Therefore the two minds must be in agreement and usually are as long as a desire for the work is present in the conscious.
Quote, paraphrasing and summation of material from the "Professional Hypnotism Manual" by John G. Kappas, Ph.D. founder of Hypnosis Motivation Institute.
