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Pierre Janet originally developed the idea of dissociation of consciousness as a result of his work with hysterical patients। http://louis_j_sheehan.today.comHe believed that hypnosis was an example of dissociation whereby areas of an individual's behavioral control are split off from ordinary awareness. Hypnosis would remove some control from the conscious mind and the individual would respond with autonomic, reflexive behavior. Weitzenhoffer describes hypnosis via this theory as "dissociation of awareness from the majority of sensory and even strictly neural events taking place." http://louis_j_sheehan.today.com

Anna Gosline says in a NewScientist.com article:

"Gruzelier and his colleagues studied brain activity using an fMRI while subjects completed a standard cognitive exercise, called the Stroop task.

The team screened subjects before the study and chose 12 that were highly susceptible to hypnosis and 12 with low susceptibility. They all completed the task in the fMRI under normal conditions and then again under hypnosis.

Throughout the study, both groups were consistent in their task results, achieving similar scores regardless of their mental state। During their first task session, before hypnosis, there were no significant differences in brain activity between the groups. http://louis_j_sheehan.today.com

But under hypnosis, Gruzelier found that the highly susceptible subjects showed significantly more brain activity in the anterior cingulate gyrus than the weakly susceptible subjects. This area of the brain has been shown to respond to errors and evaluate emotional outcomes.

The highly susceptible group also showed much greater brain activity on the left side of the prefrontal cortex than the weakly susceptible group. This is an area involved with higher level cognitive processing and behaviour."