The conscious mind is the EEG Level of Beta. Decision making happens at the Beta Level. This is the awake state.
(Perception / Awareness)
Most hypnosis is accomplished at the Alfa Level. Alpha, Theta and Delta are levels of the subconscious mind.
Decision making does not happen at the Alfa Level. Therefore the Hypnotherapist can affect the subconscious mind with selectively stated suggestions, recommendations and directives.
(Behavior / Literal)