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Imaging how attention modulates pain in humans using functional MRI.
Susanna J Bantick1, Richard G Wise, Alexander Ploghaus
1Oxford University Department of Clinical Neurology, Centre for Functional Magnetic Resonance Imaging of the Brain, John Radcliffe Hospital, Headington, Oxford, UK.
Brain : a Journal of Neurology
|February 15, 2002
Summary
Distracting the brain with cognitive tasks reduces pain perception. Functional MRI revealed that attention diversion activates affective brain regions while deactivating pain processing areas.
Area of Science:
- Neuroscience
- Pain Perception
- Cognitive Psychology
Background:
- Clinical and experimental evidence suggests attention diversion reduces pain perception.
- Understanding the neural mechanisms underlying this pain modulation is crucial.
Purpose of the Study:
- To investigate the neural systems and mechanisms involved in reduced pain perception during cognitive distraction.
- To utilize functional MRI to observe brain activity during a cognitive task and painful stimuli.
Main Methods:
- Employed a counting Stroop task as a cognitive distraction paradigm.
- Administered intermittent painful thermal stimuli to subjects.
- Utilized functional Magnetic Resonance Imaging (fMRI) to monitor brain activity.
Main Results:
- Pain intensity scores were significantly lower during the high-demand counting Stroop task compared to a neutral task.
- fMRI data showed increased activation in the affective division of the anterior cingulate cortex (ACC) and orbitofrontal regions during distraction.
- Reduced activation was observed in pain matrix areas, including the thalamus, insula, and cognitive division of the ACC.
Conclusions:
- Cognitive distraction effectively modulates pain perception, aligning with behavioral observations.
- Specific brain regions, particularly affective ACC and orbitofrontal areas, are involved in attentional modulation of pain.
- Deactivation in core pain processing areas supports the subjective reduction in pain intensity.