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.

Original publication

DOI

10.1523/jneurosci.22-07-02748.2002

Type

Journal article

Journal

The Journal of neuroscience : the official journal of the Society for Neuroscience

Publication Date

04/2002

Volume

22

Pages

2748 - 2752

Addresses

Centre for Functional Magnetic Resonance Imaging of the Brain, Department of Clinical Neurology, University of Oxford, Oxford OX3 9DU, United Kingdom. irene@fmrib.ox.ac.uk

Keywords

Hand, Periaqueductal Gray, Neural Pathways, Humans, Pain, Magnetic Resonance Imaging, Echo-Planar Imaging, Pain Measurement, Physical Stimulation, Behavior, Pain Threshold, Attention, Adult, Female, Male, Hot Temperature