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Neural processing of laughter in depression.

Thomas Ethofer1,2,3, Silvia Straub4, Benjamin Kreifelts5,6

  • 1University Clinic for Psychiatry and Psychotherapy Tübingen, Calwer Str. 14, 72076, Tubingen, Germany. Thomas.Ethofer@med.uni-tuebingen.de.

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Summary
This summary is machine-generated.

Patients with major depressive disorder (MDD) show a negativity bias when interpreting laughter

Keywords:
Anteromedial prefrontal cortexDepressionLaughterRatingSocial intentfMRI

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Social Psychology

Background:

  • Laughter serves as a crucial social signal, conveying intentions from acceptance to rejection.
  • Altered social perception is a hallmark of major depressive disorder (MDD).

Purpose of the Study:

  • To investigate the perception of social intent in laughter among individuals with MDD compared to healthy controls (HC).
  • To explore the neural underpinnings of altered laughter perception in MDD using functional magnetic resonance imaging (fMRI).

Main Methods:

  • 48 MDD patients and 52 HC participants rated the social intent of auditory and visual laughter stimuli during fMRI.
  • Depression severity was assessed using validated questionnaires.
  • Correlation and mediation analyses examined the relationship between perception bias, depression severity, and brain activation.

Main Results:

  • MDD patients exhibited a significantly more negative bias in perceiving laughter's social intent across both auditory and visual modalities.
  • This negativity bias correlated with depression severity and activation in the anteromedial prefrontal cortex (AMPFC).
  • MDD patients showed reduced AMPFC activation, which partially mediated the effect of depression severity on laughter perception.

Conclusions:

  • Major depressive disorder is associated with an altered perception of social intent conveyed through laughter.
  • The anteromedial prefrontal cortex plays a mediating role in this altered perception, with reduced activity linked to depression severity and negative bias.