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Study: Brain of Hypnotized People Undergoes
Measurable Changes
Israeli researchers have shown that hypnotism actually produces measurable
changes in the brain, refuting suggestions that it does not result in an altered
state of consciousness.
Skeptics argue that hypnotism — commonly used to treat pain, anxiety, and
phobias — is an exaggerated form of social compliance, where subjects suspend
their critical faculties to do whatever a hypnotist asks of them.
However, Prof Yadin Dudai, a researcher at The Weizmann Institute of Science,
Rehovot, insists that brain scans of people taken after a hypnotic suggestion to
forget have revealed that parts of the brain really are affected.
During the study, two groups of volunteers — people susceptible to hypnotic
suggestions, and individuals who were not — were shown a documentary depicting
a day in the life of a young woman.
After a week, the participants were placed in a brain scanner. They were then
induced into a hypnotic state, and given a posthypnotic suggestion to forget the
movie, along with a reversibility cue that would restore the memory.
The researchers tested the subjects for their recall after they had come out of
the hypnotic state. They then gave the participants the reversibility cue, and
tested their recall again.
A compared to the hypnosis-non-
susceptible group, the hypnosis-susceptible group showed reduced recall of the movie.
When the researchers analyzed brain scans of the subjects, they found
distinctive differences in specific brain areas — namely, occipital, temporal,
and prefrontal areas — among participants in the two groups.
"The surprise for us was that activity was raised during memory suppression
in one specific region in the frontal cortex," the Telegraph quoted Dudai
as saying.
In effect, he added, it probably told the other brain regions "don't even
think about retrieving that memory".
"The one thing we can say for sure is that hypnotism worked under the
conditions we used," said Prof Dudai, adding that the findings were
different from those seen in people who attempted to deceive. "We are
therefore highly confident that this is not an artifact," he added.
The researchers believe that their insights into memory suppression and recall
may help understand the mechanisms underlying some forms of amnesia, besides
explaining how people suppress distressing memories or things.
However, study co-author Avi Mendelsohn admitted that further studies were
required to determine whether the new findings gave insights into how the brain
stores memory.
(posted
by Seth-Deborah Roth)
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