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Nocebo Hyperalgesia, Partial Reinforcement, and Extinction.

Ben Colagiuri1, Veronica F Quinn1, Luana Colloca2

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Summary
This summary is machine-generated.

Partial reinforcement (PRF) can induce nocebo hyperalgesia, though weaker than continuous reinforcement (CRF). This pain hypersensitivity persists and may be reduced using PRF in clinical settings.

Keywords:
Noceboconditioningexpectancypainpartial reinforcement

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Area of Science:

  • Pain research
  • Behavioral psychology
  • Clinical neuroscience

Background:

  • Conditioning-induced nocebo hyperalgesia is well-documented.
  • Previous research exclusively used continuous reinforcement (CRF) schedules.
  • The effects of partial reinforcement (PRF) on nocebo hyperalgesia remain unknown.

Purpose of the Study:

  • To investigate if partial reinforcement (PRF) can induce nocebo hyperalgesia.
  • To compare the efficacy of PRF versus CRF in inducing nocebo hyperalgesia.
  • To examine the persistence and extinction of nocebo hyperalgesia under different reinforcement schedules.

Main Methods:

  • 135 healthy undergraduate volunteers participated.
  • Participants received nocebo treatment using electrodermal pain stimulation.
  • Random allocation to continuous reinforcement (CRF), partial reinforcement (PRF), or control groups.
  • Conditioning involved surreptitious pain increases during nocebo trials (always for CRF, 62.5% for PRF).

Main Results:

  • Partial reinforcement (PRF) was sufficient to induce nocebo hyperalgesia, but it was weaker than that induced by continuous reinforcement (CRF).
  • Nocebo hyperalgesia showed resistance to extinction, regardless of the reinforcement schedule used during training.
  • Strong concordance was observed between participants' expectancies and the induced nocebo hyperalgesia.

Conclusions:

  • Partial reinforcement (PRF) can induce nocebo hyperalgesia, offering a potentially less intense conditioning method compared to CRF.
  • Established nocebo hyperalgesia is persistent and difficult to extinguish, highlighting the importance of understanding its formation.
  • PRF may offer a novel clinical strategy to mitigate nocebo hyperalgesia intensity due to its persistence.