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Antidepressant placebo effects were simulated using a fast-acting drug infusion and sham fMRI neurofeedback. This study reveals the lateral prefrontal cortex (lPFC) role in placebo responses and mood regulation.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Psychology

Background:

  • Placebo responses in depression highlight the influence of expectancies and appraisals on mood.
  • Cognitive and neural mechanisms of placebo effects in depression remain poorly understood.
  • Experimental challenges include simulating antidepressant effects and manipulating mood.

Purpose of the Study:

  • To investigate the cognitive and neural mechanisms of antidepressant placebo effects.
  • To develop and validate an experimental paradigm for manipulating mood-related expectancies.
  • To explore the role of the lateral prefrontal cortex (lPFC) and opioid system in placebo responses.

Main Methods:

  • Developed an acute antidepressant placebo experiment using intravenous "fast-acting antidepressant" infusion and sham fMRI neurofeedback.
  • Twenty volunteers with major depression participated, rating expected and actual mood improvement.
  • Utilized mixed-effects analyses to examine trial-by-trial expectancy and mood ratings, and fMRI data.

Main Results:

  • "Drug" infusion cues increased expectancies of mood improvement.
  • Both "drug" infusion and sham neurofeedback induced reported mood improvement.
  • Greater sham neurofeedback magnitude recruited the lateral prefrontal cortex (lPFC); higher lPFC response correlated with stronger placebo effects and expectancy modulation.
  • Peripheral β-endorphin levels and depressive symptomatology moderated behavioral placebo effects.

Conclusions:

  • Demonstrated the feasibility of manipulating antidepressant placebo expectancies and their reinforcement.
  • Provided initial insights into the lPFC's role in placebo-induced expectancies and mood.
  • Offered preliminary evidence for the opioid system's involvement in antidepressant placebo effects.