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Subjective cognitive impairment: increased prefrontal cortex activation compared to controls during an encoding task.
Joanne E Rodda1, Thomas M Dannhauser, Darren J Cutinha
1University College London, Department of Mental Health Sciences, UK. j.rodda@ucl.ac.uk
International Journal of Geriatric Psychiatry
|March 5, 2009
Summary
Individuals with subjective cognitive impairment (SCI) show distinct brain activation patterns during memory tasks, potentially indicating compensatory mechanisms. Further research is needed to link these changes to early Alzheimer's disease pathology.
Area of Science:
- Neuroscience
- Cognitive Science
- Medical Imaging
Background:
- Subjective cognitive impairment (SCI) represents a preclinical stage in Alzheimer's disease (AD) continuum.
- SCI is defined by memory complaints without objective cognitive deficits.
- Altered brain activation is observed in mild cognitive impairment and at-risk individuals for AD.
Purpose of the Study:
- To investigate if individuals with SCI exhibit similar memory-related brain activation differences as those seen in mild cognitive impairment and at-risk populations.
- To explore the neural underpinnings of subjective memory complaints in the context of early AD pathology.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to compare brain activation.
- A verbal episodic memory encoding task was administered to 10 SCI subjects and 10 controls.
- Recognition accuracy and semantic processing were assessed.
Main Results:
- No significant differences in encoding success (recognition accuracy) or semantic processing were found between groups.
- Both SCI and control groups activated the left prefrontal cortex (PFC) and cerebellum during memory encoding.
- The SCI group showed additional activation in the left medial temporal, occipitoparietal, and medial frontal cortex.
- Increased activation in the left PFC of the SCI group correlated with memory task performance.
Conclusions:
- Observed brain activation differences in SCI may suggest the use of compensatory strategies in response to early AD pathology.
- Alternative explanations for these findings require consideration.
- Larger sample studies are necessary to determine if these activation changes are linked to early neuropathological processes or other factors.
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