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Inhibition through negative priming with Stroop stimuli in schizophrenia.
L Laplante1, J Everett, J Thomas
1Université Laval, Ecole de Psychologie, Ste-Foy, Quebec, Canada.
The British Journal of Clinical Psychology
|September 1, 1992
Summary
Schizophrenia impairs cognitive inhibition, affecting response times. Pre-exposure to distractors helps positive schizophrenics but not negative ones, indicating differing inhibitory deficits.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Psychopathology
Background:
- Cognitive inhibition is crucial for selective attention and task performance.
- Schizophrenia is associated with deficits in cognitive control and information processing.
- Understanding inhibitory mechanisms can differentiate subtypes of schizophrenia and related disorders.
Purpose of the Study:
- To investigate cognitive inhibition differences in positive and negative schizophrenia, depression, and healthy controls.
- To test hypotheses regarding insufficient versus persistent cognitive inhibition in schizophrenia.
- To explore the impact of distractor pre-exposure on inhibitory processes.
Main Methods:
- Utilized Stroop stimuli to measure the negative priming effect.
- Compared response times between neutral and suppressor Stroop items.
- Administered tasks to positive schizophrenics, negative schizophrenics, depressive subjects, and healthy controls.
Main Results:
- Schizophrenics exhibited weakened distractor-suppression effects, leading to similar response times for neutral and suppressor stimuli.
- Pre-exposure to lexical distractors improved performance in positive schizophrenics but not negative schizophrenics.
- Depressive subjects demonstrated a delayed development of cognitive inhibition.
Conclusions:
- Schizophrenia involves insufficient inhibitory processes, with negative symptoms indicating more severe cognitive deterioration.
- Cognitive inhibition develops differently over time in various psychiatric conditions.
- Findings support theories on the temporal evolution of inhibitory deficits in schizophrenia.
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