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Source retrieval is not properly differentiated from object retrieval in early schizophrenia: an fMRI study using
Colin Hawco1, Lisa Buchy2, Michael Bodnar2
1Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada ; Temerty Centre for Therapeutic Brain Intervention, Centre for Addiction and Mental Health, Toronto, Canada.
Neuroimage. Clinical
|January 23, 2015
Summary
Patients with schizophrenia show impaired source memory, impacting their ability to recall memory context. This deficit is linked to altered brain activity in specific regions and may contribute to hallucinations.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Source memory deficits are common in schizophrenia, potentially linked to clinical symptoms like hallucinations.
- The precise neurobiological basis for these source memory impairments remains unclear.
Purpose of the Study:
- To investigate the neurobiological underpinnings of source memory deficits in recent-onset schizophrenia.
- To explore the relationship between source memory neural activity and clinical symptoms, particularly hallucination proneness.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used during a source memory task in 25 schizophrenia patients and 24 healthy controls.
- Participants identified object recognition and source memory (person/place association) within a virtual city environment.
Main Results:
- Both groups showed neural activity for source memory, but controls exhibited more widespread activation.
- Schizophrenia patients displayed reduced differentiation between source and object memory in key brain regions (medial parietal, cingulate, frontal, temporal).
- Impaired source memory neural activity correlated with hallucination proneness in specific brain areas.
Conclusions:
- Schizophrenia patients exhibit deficits in neural circuits crucial for source memory.
- These neural circuit abnormalities may underlie both source memory impairments and contribute to auditory hallucinations.
