A self report measure of affective lability

Area of Science:

• Neurology
• Psychiatry
• Clinical Psychology

Background:

• Affective lability is a common symptom in amyotrophic lateral sclerosis (ALS).
• Existing measures do not adequately capture affective lability specific to ALS.
• A validated self-report tool is needed for clinical assessment and research.

Purpose of the Study:

• To develop and validate the Center for Neurologic Study-Lability Scale (CNS-LS).
• To create the first self-report measure for affective lability in ALS patients.
• To establish the psychometric properties of the CNS-LS.

Main Methods:

• Item generation through patient interviews, family input, and expert review.
• Administration of the proposed CNS-LS and other psychometric measures to 99 ALS patients for item selection and validity testing.
• Reliability and validity assessed through test-retest studies (n=31) and comparison with physician diagnoses (n=77).

Main Results:

• A seven-item CNS-LS emerged, with subscales for labile laughter and labile tearfulness.
• The CNS-LS demonstrated construct validity, correlating with measures of affect intensity, psychopathology, and depression.
• The scale showed good test-retest reliability, internal consistency, and accurately predicted physician diagnoses of affective lability.

Conclusions:

• The CNS-LS is a brief, user-friendly, and psychometrically sound instrument for assessing affective lability in ALS.
• The CNS-LS can serve as a valuable clinical screening tool and research instrument.
• Further research is warranted to explore the relationship between depression, frustration, anger, impatience, and affective lability in neurological disorders.