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Factors influencing Stroop performance in schizophrenia
Deanna M Barch1, Cameron S Carter, Jonathan D Cohen
1Washington University, St. Louis, MO 63130, USA. dbarch@artsci.wustl.edu
Neuropsychology
|August 5, 2004
Summary
Individuals with schizophrenia exhibit similar reaction time interference on the Stroop task, but this is influenced by word impact even in neutral conditions, not just increased errors.
Area of Science:
- Cognitive psychology
- Clinical neuroscience
- Psychopathology
Background:
- Individuals with schizophrenia often display distinct cognitive processing patterns.
- Previous research indicates altered reaction times (RTs) and error rates in schizophrenia.
Purpose of the Study:
- To investigate the relationship between errors and reaction times (RTs) in individuals with schizophrenia during the Stroop task.
- To understand the cognitive mechanisms underlying Stroop performance in schizophrenia.
Main Methods:
- A speeded Stroop task was administered to 29 individuals with schizophrenia and 29 healthy controls.
- Process dissociation analyses were used to estimate color-naming and word-reading.
- Performance metrics included reaction times and error rates.
Main Results:
- Schizophrenia patients did not show significantly increased RT interference compared to controls.
- Patients exhibited a greater impact of word stimuli even in neutral Stroop conditions.
- Increased errors in the incongruent condition did not fully explain the lack of RT interference.
Conclusions:
- The findings suggest that cognitive control in schizophrenia is affected by word processing even outside of conflict situations.
- Altered word processing contributes to the observed reaction time patterns in the Stroop task for individuals with schizophrenia.
- This highlights the complex interplay between attention, interference, and error processing in schizophrenia.