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The placebo effect: To explore or to exploit?

Kirsten Barnes1, Benjamin Margolin Rottman2, Ben Colagiuri1

  • 1University of Sydney, Australia.

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This summary is machine-generated.

People explore options and make choices, even with biologically relevant outcomes like pain relief. This study unified placebo effects and explore-exploit decision-making in a pain model.

Keywords:
Decision makingExplore exploitPainPlacebo analgesiaPlacebo effects

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Area of Science:

  • Neuroscience
  • Psychology
  • Decision Science

Background:

  • The explore-exploit paradigm typically uses low-stakes tasks, limiting understanding of decision-making for biologically relevant stimuli.
  • Decision-making processes for biologically relevant outcomes, such as pain management, remain under-investigated.

Purpose of the Study:

  • To investigate how individuals explore and exploit options when outcomes have biological relevance, specifically in a pain model.
  • To examine the interplay between placebo effects and explore-exploit decision-making strategies.
  • To understand how expectancy influences pain perception and treatment selection.

Main Methods:

  • Combined placebo and explore-exploit paradigms in a human pain model.
  • Participants underwent conditioning where sham-treatments were paired with varying pain reduction.
  • Computational modeling was used to analyze participant choices and response patterns.

Main Results:

  • Participant choices demonstrated both directed and random exploration strategies.
  • Expectancy significantly modulated pain perception, suggesting recursive placebo effects.
  • Individual differences in expectancy during conditioning predicted placebo effects in a subsequent test phase.

Conclusions:

  • Human decision-making involves directed and random exploration even for biologically relevant outcomes.
  • The study successfully unified the placebo and explore-exploit literature.
  • Expectancy plays a crucial role in modulating pain and influencing treatment selection.