Abstract
Pain is fundamentally unpleasant, a feature that protects the organism by promoting motivation and learning. Relief of aversive states, including pain, is rewarding. The aversiveness of pain, as well as the reward from relief of pain, is encoded by brain reward/motivational mesocorticolimbic circuitry. In this Review, we describe current knowledge of the impact of acute and chronic pain on reward/motivation circuits gained from preclinical models and from human neuroimaging. We highlight emerging clinical evidence suggesting that anatomical and functional changes in these circuits contribute to the transition from acute to chronic pain. We propose that assessing activity in these conserved circuits can offer new outcome measures for preclinical evaluation of analgesic efficacy to improve translation and speed drug discovery. We further suggest that targeting reward/motivation circuits may provide a path for normalizing the consequences of chronic pain to the brain, surpassing symptomatic management to promote recovery from chronic pain.
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Acknowledgements
We gratefully acknowledge comments and suggestions from I. Tracey and H. Fields. We thank P. Navratilova for help with illustrations. This work was funded by grants NS066958 and DA034975 from the US National Institutes of Health.
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Navratilova, E., Porreca, F. Reward and motivation in pain and pain relief. Nat Neurosci 17, 1304–1312 (2014). https://doi.org/10.1038/nn.3811
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