Lower recognition thresholds for sad facial expressions in subthreshold depression: a longitudinal study

Area of Science:

• Psychology
• Neuroscience
• Clinical Psychiatry

Background:

• Subthreshold depression (StD) is more common than major depressive disorder (MDD).
• Depression is linked to altered facial expression perception.
• Perceptual changes in StD and their temporal stability are not well understood.

Purpose of the Study:

• To investigate facial expression recognition thresholds in individuals with StD.
• To examine if these perceptual alterations change over a 2-month period.
• To correlate perceptual sensitivity with depressive symptom changes.

Main Methods:

• Employed the QUEST psychometric procedure to assess recognition thresholds for five facial expressions (angry, fear, happy, sad, neutral).
• Recruited individuals with StD and non-depressed controls.
• Conducted initial assessments and follow-up tests approximately 2 months later.

Main Results:

• Individuals with StD initially showed lower recognition thresholds (higher sensitivity) for sadness compared to controls.
• At follow-up, non-remitted StD individuals maintained lower thresholds for sadness, while remitted individuals did not.
• Lower initial recognition thresholds for sadness predicted less symptom improvement at follow-up.

Conclusions:

• Altered perceptual sensitivity to sad expressions is associated with the current clinical state in StD.
• Heightened sensitivity to sadness may be a marker of current depressive state in StD.
• This perceptual alteration might influence treatment outcomes in subthreshold depression.