Dimensions of executive functioning in schizophrenia and their relationship with processing speed
Gauri N Savla1, Elizabeth W Twamley, Dean C Delis
1Department of Psychiatry, University of California, San Diego, 9500 Gilman Drive, MC 0603V, La Jolla, CA 92093-0603, USA. gsavla@ucsd.edu
Schizophrenia Bulletin
|December 18, 2010
Summary
Executive functions in schizophrenia are not a single entity but comprise two distinct factors: cognitive flexibility and abstraction. Understanding these separate components is crucial for future research and treatment strategies.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Executive dysfunction in schizophrenia is poorly understood, with debate on whether it involves specific or generalized cognitive deficits.
- Current conceptualizations lack consistency, hindering progress in understanding schizophrenia's cognitive landscape.
Purpose of the Study:
- To investigate whether executive functions in schizophrenia represent a unitary or diverse set of constructs.
- To clarify the latent structure of executive functions using the Delis-Kaplan Executive Functioning System (D-KEFS).
Main Methods:
- 145 individuals with schizophrenia completed the D-KEFS and Digit Symbol tasks.
- Exploratory factor analysis (EFA) and parallel analyses were used to examine the underlying structure of executive functions.
- Bivariate correlations assessed relationships with clinical, demographic, and functional variables.
Main Results:
- EFA identified two distinct factors: cognitive flexibility/timed tests and abstraction.
- These two factors remained consistent even after accounting for processing speed.
- Cognitive flexibility correlated with psychopathology, while abstraction related to education, illness duration, and functional capacity.
Conclusions:
- Executive functions in schizophrenia can be divided into two partially related but separable subconstructs: cognitive flexibility and abstraction.
- Distinguishing between these executive function components may aid in understanding functional outcomes and neurobiological underpinnings of schizophrenia.
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