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Imaging attentional modulation of pain in the periaqueductal gray in humans
- Source :
- ResearcherID, Scopus-Elsevier
-
Abstract
- Pain is an unpleasant sensory and emotional experience usually triggered by stimulation of peripheral nerves and often associated with actual or potential tissue damage. It is well known that pain perception for patients and normal subjects can be modulated by psychological factors, such as attention, stress, and arousal. Our understanding of how this modulation occurs at a neuroanatomical level is poor. Here we neuroanatomically defined a key area in the network of brain regions active in response to pain that is modulated by attention to the painful stimulus. High-resolution functional magnetic resonance imaging was used to define brain activation to painful heat stimulation applied to the hand of nine normal subjects within the periaqueductal gray region. Subjects were asked to either focus on or distract themselves from the painful stimuli, which were cued using colored lights. During the distraction condition, subjects rated the pain intensity as significantly lower compared with when they attended to the stimulus. Activation in the periaqueductal gray was significantly increased during the distraction condition, and the total increase in activation was predictive of changes in perceived intensity. This provides direct evidence supporting the notion that the periaqueductal gray is a site for higher cortical control of pain modulation in humans.
- Subjects :
- Adult
Male
Pain Threshold
Hot Temperature
Pain
Stimulation
Sensory system
Stimulus (physiology)
Periaqueductal gray
Arousal
Distraction
Physical Stimulation
Threshold of pain
Neural Pathways
medicine
Humans
Periaqueductal Gray
Attention
ARTICLE
Pain Measurement
Behavior
medicine.diagnostic_test
Echo-Planar Imaging
General Neuroscience
Hand
Magnetic Resonance Imaging
Female
Psychology
Functional magnetic resonance imaging
Neuroscience
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- ResearcherID, Scopus-Elsevier
- Accession number :
- edsair.doi.dedup.....3be9033172b97641d6e9b82a684a016e