A method for diagnosing depression: Facial expression mimicry is evaluated by facial expression recognition

Area of Science:

• Psychology
• Neuroscience
• Clinical Psychiatry

Background:

• Facial expression mimicry is demonstrably impaired in individuals with depression.
• Understanding these mimicry deficits is crucial for developing novel diagnostic tools.

Purpose of the Study:

• To evaluate the utility of voluntary facial expression mimicry and recognition tasks in diagnosing depression.
• To identify specific deficits in mimicry accuracy and bias associated with depression.

Main Methods:

• 168 participants engaged in a voluntary facial expression mimicry task (posing seven emotions).
• 9 healthy raters assessed the accuracy and bias of imitated expressions using observer scoring.
• Emotional scores were analyzed to differentiate between depressed individuals and controls.

Main Results:

• The depression group exhibited lower accuracy in imitating happiness compared to controls.
• Depressed individuals showed increased neutrality bias across several expressions and altered happiness bias.
• Rater recognition time for imitated happiness was longer in the depression group, correlating with depression severity.

Conclusions:

• Voluntary facial expression imitation deficits (accuracy, bias, recognizability) are evident in patients with depression.
• These identified deficits offer a potential new method for the clinical diagnosis of depression.