Long answer: When you are 'under hypnosis' you are just relaxed, in a trance, so your primitive brain is not as active and your critical faculty is subdued. This enables your subconscious to work with freedom. You are able to come up with thoughts and ideas to help solve problems. During this phase you are very much in control. You will not tell me anything you don't want me to know.
The trance like state is very common. We go into trance often throughout the day. Typically we experience it when we're driving. How often, when driving, have you suddenly realised that you can't remember the last few miles? If something occurred that was dangerous during this time the primitive brain would kick in and you would react accordingly. In the same way, if I asked you for your bank details and pin number your primitive brain would be alerted and you would refuse to do so.
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Originally posted on Merryfield Hypnotherapy.