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A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment
Published on: January 11, 2020
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Functional changes in the cortical semantic network in amnestic mild cognitive impairment
Jessica Pineault1, Pierre Jolicoeur1, Stephan Grimault1
1Département de Psychologie (CERNEC), Université de Montréal.
Neuropsychology
|May 30, 2018
Summary
Individuals with amnestic Mild Cognitive Impairment (aMCI) show impaired semantic memory and altered brain activity in key semantic network areas. This hyperactivation may precede structural changes, offering early insights into Alzheimer's disease progression.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Medical Imaging
Background:
- Semantic memory impairment is a hallmark of amnestic Mild Cognitive Impairment (aMCI), a precursor to Alzheimer's Disease (AD).
- The neural underpinnings of semantic deficits in aMCI remain poorly understood.
- Investigating these mechanisms is crucial for early detection and intervention in AD.
Purpose of the Study:
- To explore the brain mechanisms underlying semantic performance in aMCI patients.
- To identify specific neural correlates of semantic processing deficits in aMCI.
- To determine if these neural alterations precede structural brain changes.
Main Methods:
- A semantic categorization task was administered to aMCI patients and healthy controls.
- Brain activity was recorded using magnetoencephalography (MEG) during the task.
- Behavioral performance and patterns of neural activation were analyzed.
Main Results:
- aMCI patients exhibited significantly slower and less accurate performance on the semantic task compared to controls.
- The aMCI group showed hyperactivation in the right anterior temporal lobe (ATL) and fusiform gyrus.
- This hyperactivation was positively associated with gray matter integrity but not atrophy.
Conclusions:
- Abnormal functional activation in the semantic network, particularly the right ATL and fusiform gyrus, is evident early in aMCI.
- This pattern of hyperactivation may represent a compensatory mechanism that precedes structural alterations.
- Findings suggest early disruption of the semantic network in the disease process of aMCI.
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