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Processing speed mediates the relationship between verbal memory, verbal fluency, and functional outcome in chronic
Natalia Ojeda1, Javier Peña, Pedro Sánchez
1Department of Psychology, University of Deusto, Avda. Universidades, 24. 48007 Bilbao, Spain. nojeda@fice.deusto.es
Schizophrenia Research
|February 12, 2008
Summary
Processing speed fully mediates the link between verbal fluency, verbal memory, and functional disability in schizophrenia patients. This finding highlights processing speed as a key factor influencing outcomes in chronic schizophrenia.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia is associated with diminished verbal fluency and memory, which can predict functional disability.
- Processing speed is a critical cognitive function that may mediate other cognitive deficits in schizophrenia.
Purpose of the Study:
- To investigate the mediating role of processing speed in the relationship between verbal fluency, verbal memory, and functional disability in chronic schizophrenia patients.
Main Methods:
- A study involving 90 hospitalized patients with chronic schizophrenia and 30 healthy controls.
- Neuropsychological tests assessed verbal fluency, verbal memory, motor speed, and processing speed.
- Functional disability was measured using the Disability Assessment Schedule (DAS-WHO) and number of hospitalizations.
Main Results:
- Patients showed severe impairments in verbal fluency and memory, significantly predicting functional outcome.
- The predictive significance of verbal fluency and verbal memory on functional outcome was substantially reduced when processing speed was included in regression analyses.
- Sobel's equation confirmed that processing speed fully mediated the relationship between cognitive deficits and functional disability.
Conclusions:
- Processing speed appears to be a central factor linking cognitive impairments (verbal fluency, verbal memory) to functional disability in chronic schizophrenia.
- Targeting processing speed deficits may be a crucial therapeutic strategy to improve functional outcomes in schizophrenia.
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