Cognitive Subtyping in Schizophrenia: A Latent Profile Analysis

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Cognitive dysfunction is a primary characteristic of schizophrenia, contributing to disease heterogeneity.
• Current research on cognitive subtyping in schizophrenia faces limitations due to inconsistent methodologies and lack of longitudinal validation.
• It remains unclear whether cognitive performance in schizophrenia represents a linear continuum of severity or distinct subtypes.

Purpose of the Study:

• To identify and validate distinct cognitive subtypes in schizophrenia patients.
• To investigate the longitudinal stability of these cognitive profiles.
• To determine if cognitive profiles represent a unidimensional severity continuum or discrete subtypes.

Main Methods:

• Latent profile analysis (LPA) was used to identify cognitive subtypes in a schizophrenia discovery cohort (n=659) and validated in an independent cohort (n=108).
• Brief Assessment of Cognition in Schizophrenia (BACS) measured cognitive performance.
• Latent transition analysis (LTA) assessed longitudinal stability, and confirmatory factor analysis (CFA) examined the structure of cognitive profiles.

Main Results:

• A robust 4-profile solution for cognitive performance was identified and replicated: 'less-impaired,' two 'intermediate cognitive impairment' subtypes (differentiated by executive function), and a 'globally impaired' subtype.
• These cognitive profiles demonstrated relative stability over a 10-week period.
• Confirmatory factor analysis supported distinct cognitive profiles over a linear severity continuum, with observed associations between profiles and negative symptoms.

Conclusions:

• Cognitive performance in schizophrenia is best characterized by distinct subtypes rather than a single severity continuum.
• These identified cognitive subtypes are longitudinally stable and associated with negative symptoms.
• Cognitive subtyping offers a valuable approach for refining schizophrenia phenotypes, understanding biological underpinnings, and personalizing clinical interventions.