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Updated: Nov 17, 2025
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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
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Pre-attentive Visual Processing in Alzheimer's Disease: An Event-related Potential Study
Eunchan Na1, Kanghee Lee1, Eun J Kim1
1Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea.
Current Alzheimer Research
|February 17, 2021
Summary
Alzheimer's Disease (AD) patients show deficits in pre-attentive visual processing, indicated by reduced event-related potentials (ERPs). This suggests the visual oddball task can aid early AD diagnosis.
Area of Science:
- Neuroscience
- Cognitive Science
- Medical Diagnostics
Background:
- Early Alzheimer's Disease (AD) detection is critical but challenging with traditional tests.
- Visual processing deficits are observed in AD patients.
- Event-related potentials (ERPs) offer high temporal resolution for studying pre-attentive processing.
Purpose of the Study:
- To investigate visual attentional processing in adults with AD.
- To compare pre-attentive and attentive visual processing between AD patients and cognitively normal controls.
- To evaluate the utility of ERPs in assessing visual processing in AD.
Main Methods:
- Recruited cognitively normal (CN) elderly controls and probable AD patients.
- Administered a three-stimulus visual oddball task.
- Analyzed mismatch negativity (vMMN), P3a, and P3b ERP components.
Main Results:
- AD patients exhibited significantly smaller late vMMN amplitudes compared to CN.
- AD patients showed significantly smaller P3a amplitudes for infrequent deviant stimuli.
- AD patients demonstrated significantly smaller P3b amplitudes for target stimuli.
Conclusions:
- Alzheimer's Disease patients display pre-attentive visual processing deficits.
- These deficits may impact higher-order cognitive functions.
- The visual oddball paradigm using ERPs shows potential for clinical diagnostic information in AD.
