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Associative memory encoding and recognition in schizophrenia: an event-related fMRI study
Martin Lepage1, Alonso Montoya, Marc Pelletier
1Brain Imaging Group, Douglas Hospital Research Centre, Verdun, Quebec, Canada. martin.lepage@mcgill.ca
Biological Psychiatry
|July 4, 2006
Summary
Functional Magnetic Resonance Imaging (fMRI) revealed that individuals with schizophrenia have reduced prefrontal cortex activity during associative memory tasks, explaining their memory deficits.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Schizophrenia is associated with selective associative memory deficits.
- The neural underpinnings of these deficits require further investigation.
Purpose of the Study:
- To examine the neural basis of selective associative memory deficits in schizophrenia using functional Magnetic Resonance Imaging (fMRI).
Main Methods:
- Event-related fMRI was employed in 15 individuals with schizophrenia and 18 controls.
- Participants completed pair and item memory encoding and recognition tasks.
- fMRI data analysis focused on correct responses using a random effects model.
Main Results:
- Behaviorally, schizophrenia patients showed impaired associative recognition but intact item recognition compared to controls.
- fMRI revealed reduced activity in the prefrontal cortex and cingulate gyrus during encoding in the schizophrenia group.
- During recognition, controls exhibited greater left dorsolateral and right inferior prefrontal activation than the schizophrenia group.
Conclusions:
- The prefrontal cortex plays a critical role in the selective associative memory deficits observed in schizophrenia.
- These findings highlight the neural basis of memory impairments in schizophrenia.
