Summary

Original source:
http://www.newscientist.com/news/news.jsp?id=ns99996385

Details

• Hypnosis is more than just a party trick, it measurably changes how the brain works, says a UK researcher.
• Hypnosis significantly affects the activity in a part of the brain responsible for detecting and responding to errors, says John Gruzelier, a psychologist at Imperial College in London.
• Using functional brain imaging, he also found that hypnosis affects an area that controls higher level executive functions.
• "This explains why, under hypnosis, people can do outrageous things that ordinarily they wouldn't dream of doing," says Gruzelier, who presented his study at the British Association for the Advancement of Science Festival in Exeter, UK.
• Gruzelier hopes it will also benefit emerging research showing, for example, that hypnosis can help cancer patients deal with painful treatments.
• 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.
• During their first task session, before hypnosis, there were no significant differences in brain activity between the groups.
• 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.
• "This is confirming our model of hypnosis with very direct evidence of brain function," he says.
• Peter Naish, at the UK's Open University, says this moves the understanding of hypnosis away from the popular misconceptions created by showy stage hypnotists.

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