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The Journal of Neurophysiology Vol. 86 No. 1 July 2001, pp. 402-411
Copyright ©2001 by the American Physiological Society
1Department of Neurology and Neurosurgery, McGill University; and 2McConnell Brain Imaging Center, Montreal Neurological Institute, Montreal, Quebec H3A 2B4, Canada; 3Division of Behavioral Neurology and Cognitive Neuroscience, Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242; 4Département de stomatologie, Faculté de médecine dentaire and 5Centre de recherche en sciences neurologiques, Université de Montréal, Montreal, Quebec H3C 3J7; and 6Department of Anesthesiology, McGill University, Montreal, Quebec H3A 1A1, Canada
Hofbauer, Robert K.,
Pierre Rainville,
Gary H. Duncan, and
M. Catherine Bushnell.
Cortical Representation of the Sensory Dimension of Pain. J. Neurophysiol. 86: 402-411, 2001. It is
well accepted that pain is a multidimensional experience, but little is
known of how the brain represents these dimensions. We used positron
emission tomography (PET) to indirectly measure pain-evoked cerebral
activity before and after hypnotic suggestions were given to modulate
the perceived intensity of a painful stimulus. These techniques were
similar to those of a previous study in which we gave suggestions to
modulate the perceived unpleasantness of a noxious stimulus.
Ten volunteers were scanned while tonic warm and noxious heat stimuli
were presented to the hand during four experimental conditions: alert
control, hypnosis control, hypnotic suggestions for increased-pain
intensity and hypnotic suggestions for decreased-pain intensity. As
shown in previous brain imaging studies, noxious thermal stimuli
presented during the alert and hypnosis-control conditions reliably
activated contralateral structures, including primary somatosensory
cortex (S1), secondary somatosensory cortex (S2), anterior cingulate
cortex, and insular cortex. Hypnotic modulation of the intensity of the
pain sensation led to significant changes in pain-evoked activity
within S1 in contrast to our previous study in which specific
modulation of pain unpleasantness (affect), independent of pain
intensity, produced specific changes within the ACC. This double
dissociation of cortical modulation indicates a relative specialization
of the sensory and the classical limbic cortical areas in the
processing of the sensory and affective dimensions of pain.
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