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Negative symptoms and executive function in schizophrenia: does their relationship change with illness duration?
Alexandra Bagney1, Roberto Rodriguez-Jimenez, Isabel Martinez-Gras
1Department of Psychiatry, Instituto de Investigación Hospital 12 de Octubre, Madrid, Spain. alexbagney@gmail.com
Psychopathology
|November 14, 2012
Summary
The link between negative symptoms and cognitive deficits in schizophrenia varies with illness duration. Early in schizophrenia, negative symptoms relate to non-perseverative errors, while later, they link to perseverative errors.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Negative symptoms and cognitive dysfunction significantly impact schizophrenia's prognosis and daily functioning.
- The precise relationship between these deficits and influencing factors remains unclear.
Purpose of the Study:
- To examine how the association between negative symptoms and executive function evolves with schizophrenia duration.
- To identify stage-specific patterns in the negative symptom-executive function relationship.
Main Methods:
- Assessed 200 schizophrenia patients using the Positive and Negative Syndrome Scale and Wisconsin Card Sorting Test (WCST).
- Classified patients into three groups based on illness duration: short (≤5 years), intermediate (6-20 years), and long (>20 years).
Main Results:
- Medium correlations between negative symptoms and WCST performance (completed categories) were observed across all groups.
- Negative symptoms correlated with non-perseverative WCST errors in the short duration group.
- In the long duration group, negative symptoms correlated with perseverative WCST errors.
Conclusions:
- A distinct relationship exists between negative symptoms and cognitive function at different schizophrenia stages.
- Illness duration is a critical factor to consider when investigating the link between negative symptoms and cognition in schizophrenia.
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