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Lithium effects on impulsivity and emotional processing.

Fitri Fareez Ramli1,2,3, Catherine J Harmer1,2, Philip J Cowen1,2

  • 1Clinical Psychopharmacology Group, Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, UK.

Scientific Reports
|November 23, 2025
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Summary
This summary is machine-generated.

Short-term lithium treatment in healthy individuals created a positive bias in emotional processing, potentially explaining its mood disorder benefits. This study explored lithium

Keywords:
Emotional processingImpulsivityLithiumReward

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Pharmacology

Background:

  • Lithium is a recognized mood stabilizer for mood disorders.
  • The precise mechanisms underlying lithium's effects on impulsivity and emotional processing remain incompletely understood.
  • Investigating short-term lithium's impact on emotional processing and decision-making in healthy volunteers is crucial for understanding its therapeutic actions.

Purpose of the Study:

  • To examine the effects of a five-day lithium regimen on decision-making, reward-seeking behavior, and emotional processing in healthy participants.
  • To elucidate the impact of lithium on impulsivity and emotional perception.

Main Methods:

  • A double-blind, placebo-controlled, crossover study involving 16 healthy adult participants.
  • Participants received daily lithium (800 mg) or placebo for five days, followed by a crossover.
  • Assessments included the Cambridge Gambling Task for impulsivity and the Emotional Testing Battery for emotional processing.

Main Results:

  • Lithium treatment did not significantly affect impulsivity or reward-seeking behaviors.
  • A significant interaction was observed in facial expression recognition, with lithium altering the accuracy of recognizing disgust, sadness, and fear.
  • Lithium exposure led to a positive emotional bias in encoding self-referent words, particularly negative ones.

Conclusions:

  • Short-term lithium administration in healthy individuals induces a positive emotional bias in facial recognition and self-referent word encoding.
  • These alterations in emotional processing may represent an early mechanism contributing to lithium's efficacy in treating mood disorders.
  • Further research is warranted to explore the long-term effects and clinical implications of these findings.