Meta-analysis of neural systems underlying placebo analgesia from individual participant fMRI data

Matthias Zunhammer, Tamás Spisák, Tor D. Wager () and Ulrike Bingel ()
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Matthias Zunhammer: University Hospital Essen
Tamás Spisák: University Hospital Essen
Tor D. Wager: Dartmouth College
Ulrike Bingel: University Hospital Essen

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract The brain systems underlying placebo analgesia are insufficiently understood. Here we performed a systematic, participant-level meta-analysis of experimental functional neuroimaging studies of evoked pain under stimulus-intensity-matched placebo and control conditions, encompassing 603 healthy participants from 20 (out of 28 eligible) studies. We find that placebo vs. control treatments induce small, widespread reductions in pain-related activity, particularly in regions belonging to ventral attention (including mid-insula) and somatomotor networks (including posterior insula). Behavioral placebo analgesia correlates with reduced pain-related activity in these networks and the thalamus, habenula, mid-cingulate, and supplementary motor area. Placebo-associated activity increases occur mainly in frontoparietal regions, with high between-study heterogeneity. We conclude that placebo treatments affect pain-related activity in multiple brain areas, which may reflect changes in nociception and/or other affective and decision-making processes surrounding pain. Between-study heterogeneity suggests that placebo analgesia is a multi-faceted phenomenon involving multiple cerebral mechanisms that differ across studies.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21179-3

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DOI: 10.1038/s41467-021-21179-3

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