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Related Experiment Video

Updated: Dec 20, 2025

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Operant nociception in nonhuman primates.

Brian D Kangas1, Jack Bergman

  • 1Harvard Medical School, McLean Hospital, Belmont, MA, USA.

Pain
|June 28, 2014
PubMed
Summary
This summary is machine-generated.

Developing new pain management strategies is crucial. This study introduces a novel primate model to assess how pain affects voluntary actions and how analgesics restore them, offering a more clinically relevant preclinical pain assay.

Keywords:
NOP agonistsNociception assayOperant behaviorOpioid efficacySquirrel monkeyThermal pullμ-Opioids

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Effective pain management remains a significant public health challenge.
  • Current preclinical pain assays often measure simple reflexes, not complex behaviors disrupted by pain or medication side effects.
  • Novel translational research, including improved preclinical assays, is needed for developing better pain medications.

Purpose of the Study:

  • To describe an apparatus and procedure for evaluating the impact of nociceptive stimuli on voluntary behavior in nonhuman primates.
  • To assess the capacity of analgesic drugs to restore voluntary behavior disrupted by nociceptive stimuli.
  • To provide a preclinical model that evaluates both antinociception and behavioral selectivity of drugs.

Main Methods:

  • Squirrel monkeys were trained to interact with a thermode for a food reward.
  • Nociceptive thresholds were determined by stepwise increases in thermode temperature until responding ceased.
  • The effects of opioid analgesics, d-amphetamine, and Δ(9)-THC on nociceptive thresholds and response disruption were evaluated.

Main Results:

  • Opioid analgesics produced dose-dependent increases in nociceptive thresholds, consistent with traditional antinociception measures.
  • d-amphetamine and Δ(9)-THC did not significantly alter nociceptive thresholds in this model.
  • The procedure allowed for concurrent assessment of behavioral disruption and drug-induced restoration, offering an index of behavioral selectivity.

Conclusions:

  • This novel primate behavioral assay provides a more clinically relevant measure of antinociception than traditional reflex-based methods.
  • The model can differentiate the effects of various analgesics on voluntary behavior, aiding in the development of medications with improved side effect profiles.
  • This research supports the development of innovative preclinical tools for advancing pain management therapies.