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Insight and prefrontal cortex in first-episode Schizophrenia
Mujeeb U Shad1, Sri Muddasani, Konasale Prasad
1Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA. shadmu@upmc.edu
Neuroimage
|June 29, 2004
Summary
Poor insight in schizophrenia is linked to reduced right dorsolateral prefrontal cortex (DLPFC) volume and specific cognitive deficits, not general psychopathology. This suggests a neurobiological basis for insight impairment in early psychosis.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Impaired insight is a common symptom in schizophrenia.
- The neurobiological underpinnings of insight deficits remain underexplored, particularly in antipsychotic-naive individuals.
- Prefrontal cortex dysfunction is hypothesized to underlie insight impairments.
Purpose of the Study:
- To investigate the relationship between insight, neurocognition, and dorsolateral prefrontal cortex (DLPFC) volumes in first-episode, antipsychotic-naive schizophrenia patients.
- To determine if specific cognitive deficits or prefrontal structural changes are associated with poor insight.
Main Methods:
- Compared DLPFC volumes using MRI scans in 35 first-episode schizophrenia patients categorized by insight (good vs. poor).
- Assessed neurocognitive function using the Wisconsin Card Sort Test (WCST) and other neuropsychological measures.
- Evaluated psychopathological symptoms.
Main Results:
- Patients with poor insight exhibited significantly reduced right DLPFC volumes compared to those with good insight.
- Poor insight was associated with higher perseverative errors (PEs) on the WCST, indicating executive function deficits.
- No significant differences were found in other neurocognitive measures or psychopathology between the groups.
Conclusions:
- Poor insight in early schizophrenia may stem from specific neurocognitive deficits associated with dorsolateral prefrontal cortex dysfunction.
- These findings suggest a localized neurobiological basis for insight impairment, distinct from global cognitive decline or psychopathology variations.