Issues in selection of instruments to measure negative symptoms

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Measurement of negative symptoms in psychiatric disorders is crucial for treatment efficacy.
• Existing scales like SANS, PANSS, Marder Negative Factor, and NSA-16 have limitations in domain coverage and administration.
• Advances in understanding negative symptoms necessitate updated and refined assessment tools.

Purpose of the Study:

• To review the evolving landscape of negative symptom assessment instruments.
• To introduce and discuss the development of novel measures, CAINS and BNSS, in response to the NIMH-MATRICS consensus.
• To highlight the features and psychometric properties of these new instruments.

Main Methods:

• Review of current literature and consensus statements regarding negative symptom assessment.
• Description of the development and refinement process for CAINS and BNSS.
• Evaluation of the domain coverage, informant use, and psychometric properties of existing and novel instruments.

Main Results:

• Several established instruments (SANS, PANSS, NSA-16) are valid but differ in key characteristics.
• CAINS and BNSS were developed based on the 2005 NIMH-MATRICS statement.
• Both CAINS and BNSS cover five domains of negative symptoms, differentiate anhedonia aspects, and assess social desire, showing promising psychometric properties.

Conclusions:

• The field of negative symptom measurement is dynamic, with ongoing development of new instruments.
• CAINS and BNSS represent advancements in assessing negative symptoms, addressing limitations of older scales.
• These novel instruments demonstrate potential for improved accuracy and comprehensiveness in clinical trials for negative symptoms.