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Published on: August 30, 2011
Electrophysiological correlates of amnestic mild cognitive impairment in a simon task
Jesús Cespón1, Santiago Galdo-Álvarez, Fernando Díaz
1Department of Clinical Psychology and Biological Psychology, University of Santiago de Compostela, Santiago de Compostela, Galiza, Spain.
Abstract:
Amnestic mild cognitive impairment (aMCI) represents a prodromal stage of Alzheimer`s disease (AD), especially when additional cognitive domains are affected (Petersen et al., 2009). Thus, single-domain amnestic MCI (sdaMCI) and multiple-domain-amnestic MCI (mdaMCI) biomarkers are important for enabling early interventions to help slow down progression of the disease. Recording event-related potentials (ERPs) is a non-invasive and inexpensive measure of brain activity associated with cognitive processes, and it is of interest from a clinical point of view. The ERP technique may also be useful for obtaining early sdaMCI and mdaMCI biomarkers because ERPs are sensitive to impairment in processes that are not manifested at behavioral or clinical levels. In the present study, EEG activity was recorded in 25 healthy participants and 30 amnestic MCI patients (17 sdaMCI and 13 mdaMCI) while they performed a Simon task. The ERPs associated with visuospatial (N2 posterior-contralateral - N2pc -) and motor (lateralized readiness potential - LRP -) processes were examined. The N2pc amplitude was smaller in participants with mdaMCI than in healthy participants, which indicated a decline in the correlates of allocation of attentional resources to the target stimulus. In addition, N2pc amplitude proved to be a moderately good biomarker of mdaMCI subtype (0.77 sensitivity, 0.76 specificity). However, the LRP amplitude was smaller in the two MCI groups (sdaMCI and mdaMCI) than in healthy participants, revealing a reduction in the motor resources available to execute the response in sdaMCI and mdaMCI patients. Furthermore, the LRP amplitude proved to be a valid biomarker (0.80 sensitivity, 0.92 specificity) of both amnestic MCI subtypes.
Insights
Event-related potentials (ERPs) can identify early biomarkers for amnestic mild cognitive impairment (aMCI). Reduced N2pc amplitude indicates attentional decline in multiple-domain aMCI, while reduced LRP amplitude signals motor resource deficits in both single- and multiple-domain aMCI.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Biomarkers
Background:
- Amnestic mild cognitive impairment (aMCI) is a precursor to Alzheimer's disease (AD).
- Identifying early biomarkers for single-domain (sdaMCI) and multiple-domain (mdaMCI) subtypes is crucial for timely intervention.
- Event-related potentials (ERPs) offer a non-invasive method to assess cognitive processes and detect subtle impairments.
Purpose of the Study:
- To investigate the utility of ERPs, specifically the N2pc and LRP components, as biomarkers for sdaMCI and mdaMCI.
- To assess differences in ERPs between healthy controls and individuals with amnestic MCI during a Simon task.
- To determine the diagnostic accuracy of N2pc and LRP amplitudes for classifying MCI subtypes.
Main Methods:
- EEG activity was recorded from 25 healthy participants and 30 aMCI patients (17 sdaMCI, 13 mdaMCI) performing a Simon task.
- Analysis focused on the N2pc (visuospatial attention) and LRP (motor response) ERP components.
- Sensitivity and specificity of N2pc and LRP amplitudes were calculated to evaluate their biomarker potential.
Main Results:
- Reduced N2pc amplitude in mdaMCI patients compared to controls, indicating impaired attentional resource allocation.
- N2pc amplitude showed moderate biomarker potential for mdaMCI (0.77 sensitivity, 0.76 specificity).
- Reduced LRP amplitude in both sdaMCI and mdaMCI patients compared to controls, suggesting diminished motor resource availability.
- LRP amplitude demonstrated strong biomarker potential for both aMCI subtypes (0.80 sensitivity, 0.92 specificity).
Conclusions:
- ERP components, particularly LRP, show promise as sensitive and specific biomarkers for amnestic mild cognitive impairment subtypes.
- N2pc and LRP amplitudes can help differentiate between healthy individuals and those with MCI, aiding in early diagnosis.
- These findings support the use of ERPs in clinical settings for the early detection and characterization of aMCI.
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