Instruments measuring blunted affect in schizophrenia: a systematic review

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Blunted affect, or emotional blunting, is a core symptom in schizophrenia, impacting emotional expression.
• Early assessment tools like the Rating Scale for Emotional Blunting paved the way for current diagnostic instruments.

Purpose of the Study:

• To systematically review and compare instruments used for assessing blunted affect in schizophrenia patients.
• To provide researchers and clinicians with a comparative analysis of instrument types, characteristics, administration, and psychometric properties.

Main Methods:

• Systematic review of studies reporting psychometric properties of blunted affect assessment instruments.
• Inclusion of 15 articles and 10 instruments from 30 reviewed full-text articles.
• Exclusion of reviews and case studies.

Main Results:

• Instruments commonly assess gestures, facial expressions, and vocal expressions related to blunted affect.
• The CAINS Self-report Expression Subscale demonstrated low internal consistency.
• Instruments showed minimal correlation with positive symptoms and depression, indicating good discriminant validity.

Conclusions:

• A range of instruments exist for assessing blunted affect in schizophrenia, with varying psychometric properties.
• The CAINS Self-report Expression Subscale may not reliably measure self-reported blunted affect.
• Current instruments appear effective in differentiating blunted affect from depression and positive symptoms.