Psychologist, John Gruzelier, at Imperial College in London says higher-level brain functions are deeply influenced because hypnosis significantly affects brain activity that is responsible for detecting and responding to errors. Using functional magnetic resonance imaging (fMRI), Gruzelier and his team studied the brain activity of subjects as they completed Stroop tasks (standard cognitive exercises). Before hypnosis, no significant differences in brain activity between the participants of both groups were indicated. Under hypnosis, however, Gruzelier found that highly susceptible subjects showed significantly more brain activity in the anterior cingulate gyrus (area of brain that responds to errors and evaluates emotional outcomes) than weakly susceptible subjects. The highly susceptible group also showed much greater brain activity on the left side of the prefrontal cortex (area of brain associated with higher level cognitive processing and behavior) than the weakly susceptible group.
Gruzelier concluded that, under hypnosis, these brain areas must work harder to achieve the same cognitive task results. Thus “confirming our model of hypnosis with very direct evidence of brain function.” And Peter Naish, at the UK's Open University, added, "We have a technique that has now moved towards evidence-based treatments. Gruzelier's work is showing for sure that the brain is doing quite different things under hypnosis than in normal everyday existence."
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