Cortico-Brainstem Mechanisms of Biased Perceptual Decision-Making in the Context of Pain

Katja Wiech*, Falk Eippert, Joachim Vandekerckhove, Jonas Zaman, Katerina Placek, Francis Tuerlinckx, Johan W S Vlaeyen, Irene Tracey

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Prior expectations can bias how we perceive pain. Using a drift diffusion model, we recently showed that this influence is primarily based on changes in perceptual decision-making (indexed as shift in starting point). Only during unexpected application of high-intensity noxious stimuli, altered information processing (indexed as increase in drift rate) explained the expectancy effect on pain processing. Here, we employed functional magnetic resonance imaging to investigate the neural basis of both these processes in healthy volunteers. On each trial, visual cues induced the expectation of high- or low-intensity noxious stimulation or signaled equal probability for both intensities. Participants categorized a subsequently applied electrical stimulus as either low- or high-intensity pain. A shift in starting point towards high pain correlated negatively with right dorsolateral prefrontal cortex activity during cue presentation underscoring its proposed role of "keeping pain out of mind". This anticipatory right dorsolateral prefrontal cortex signal increase was positively correlated with periaqueductal gray (PAG) activity when the expected high-intensity stimulation was applied. A drift rate increase during unexpected high-intensity pain was reflected in amygdala engagement and increased functional connectivity between amygdala and PAG. Our findings suggest involvement of the PAG in both decision-making bias and altered information processing to implement expectancy effects on pain. PERSPECTIVE: Modulation of pain through expectations has been linked to changes in perceptual decision-making and altered processing of afferent information. Our results suggest involvement of the dorsolateral prefrontal cortex, amygdala, and periaqueductal gray in these processes.

Original languageEnglish
Pages (from-to)680-692
Number of pages13
JournalThe Journal of Pain
Volume23
Issue number4
Early online date29 Nov 2021
DOIs
Publication statusPublished - Apr 2022

Keywords

  • AMYGDALA
  • CONNECTIVITY
  • DORSOLATERAL PREFRONTAL CORTEX
  • EXPECTATION
  • FEAR
  • FMRI
  • HUMAN PARIETAL OPERCULUM
  • MODULATION
  • PLACEBO
  • PREDICTION
  • Perceptual decision-making
  • amygdala
  • bias
  • expectation
  • periaqueductal gray
  • prefrontal

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