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fMRI Provides Visual Evidence of Pain

Ann-Marie Lindstrom  |  Issue: January 2015  |  January 1, 2015

“Since the same finding was observed in fibromyalgia and chronic low back pain patients, this raises the intriguing possibility that DMN-insula connectivity may be used as a marker of clinical pain across pain patient populations of different etiology,” says Dr. Loggia.

The authors cite the results as support for using ASL to evaluate clinical pain. Resting DMN connectivity may have potential as a neuroimaging biomarker to detect pain. Neuroimaging findings could also prove valuable as “surrogate endpoints” in drug research.

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Summary

In sum, these studies demonstrate that neuro­imaging can be a powerful tool that is capable of identifying brain changes (e.g., increases in regional cerebral blood flow or changes in the way brain regions communicate with each other) related to the experience of clinical pain. Moreover, the observation of disruption in the brain responses to pain anticipation and pain relief observed in fibromyalgia patients shows that fMRI can also provide insight into the pathological mechanisms underlying this and other pain disorders. Altogether, these neuroimaging findings turn personal, subjective experiences into objective, measurable evidence and shed new light on the brain alterations associated with chronic pain conditions.


Ann-Marie Lindstrom is an independent writer and editor based in the Tucson, Ariz., area.

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What Is fMRI? See the change

According to the Center for Functional MRI at UC San Diego School of Medicine, “The discovery that MRI could be made sensitive to brain activity, as well as brain anatomy, is only about 20 years old. The essential observation was that when neural activity increased in a particular area of the brain, the MR signal also increased by a small amount. Although this effect involves a signal change of only about 1%, it is still the basis for most of the fMRI studies done today. In the simplest fMRI experiment, a subject alternates between periods of doing a particular task and a control state, such as 30 second blocks looking at a visual stimulus alternating with 30 second blocks with eyes closed. The fMRI data is analyzed to identify brain areas in which the MR signal has a matching pattern of changes, and these areas are taken to be activated by the stimulus.”

Source: http://fmri.ucsd.edu/Research/whatisfmri.html

The Research

Abstract—Disrupted brain circuitry for pain-related reward/punishment in fibromyalgia1

Objective: While patients with fibromyalgia (FM) are known to exhibit hyperalgesia, the central mechanisms contributing to this altered pain processing are not fully understood. This study was undertaken to investigate potential dysregulation of the neural circuitry underlying cognitive and hedonic aspects of the subjective experience of pain, such as anticipation of pain and anticipation of pain relief.

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Filed under:ConditionsResearch RheumSoft Tissue Pain Tagged with:brainLindstromMRIPainResearchrheumatologyscan

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