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Some researchers believe that
hypnosis is more than role-playing because hypnotized individuals still
perform behaviors even when they believe that no one is observing them.
Brain activity changes during hypnosis, though some imagined visual
experiences while hypnotized produce similar activity as when a person
views the same thing while not hypnotized. Some studies demonstrated
increased information processing speed during hypnosis, with diminished
Stroop effects for hypnotized participants.
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Hilgard believed hypnosis involved a
dissociation, and that people are able to endure pain during hypnosis
by dissociating those sensations from their reactions to the pain.
Alternately, hypnosis may relieve pain by moving our selective attention
away from the painful stimulus, with activation in the somatosensory
cortex region and less activation at the site of the pain.
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Although this remains a point of
contention, researchers have established that we do use dual processing
to filter information in our everyday lives, and multiple processes
could also be at work here. Current research focuses on the influence of
biological, social and psychological factors on hypnosis.
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