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A cognitive electrophysiological signature differentiates amnestic mild cognitive impairment from normal aging

Journal Article · · Alzheimer's Research & Therapy
 [1];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Kentucky, Lexington, KY (United States); DOE/OSTI
  2. Univ. of Kentucky, Lexington, KY (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Background: Noninvasive and effective biomarkers for early detection of amnestic mild cognitive impairment (aMCI) before measurable changes in behavioral performance remain scarce. Cognitive event-related potentials (ERPs) measure synchronized synaptic neural activity associated with a cognitive event. Loss of synapses is a hallmark of the neuropathology of early Alzheimer’s disease (AD). In the present study, we tested the hypothesis that ERP responses during working memory retrieval discriminate aMCI from cognitively normal controls (NC) matched in age and education. Methods: Eighteen NC, 17 subjects with aMCI, and 13 subjects with AD performed a delayed match-to-sample task specially designed not only to be easy enough for impaired participants to complete but also to generate comparable performance between subjects with NC and those with aMCI. Scalp electroencephalography, memory accuracy, and reaction times were measured. Results: Whereas memory performance separated the AD group from the others, the performance of NC and subjects with aMCI was similar. In contrast, left frontal cognitive ERP patterns differentiated subjects with aMCI from NC. Enhanced P3 responses at left frontal sites were associated with nonmatching relative to matching stimuli during working memory tasks in patients with aMCI and AD, but not in NC. The accuracy of discriminating aMCI from NC was 85% by using left frontal match/nonmatch effect combined with nonmatch reaction time. Conclusions: The left frontal cognitive ERP indicator holds promise as a sensitive, simple, affordable, and noninvasive biomarker for detection of early cognitive impairment.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
China Abroad Scholarship Fund; Chinese Academy of Sciences and State Administration of Foreign Experts Affairs (CAS/SAFEA); National Institutes of Health (NIH); National Science Foundation of China; USDOE Office of Science (SC); University of Kentucky Department of Behavioral Science
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1627019
Journal Information:
Alzheimer's Research & Therapy, Journal Name: Alzheimer's Research & Therapy Journal Issue: 1 Vol. 9; ISSN 1758-9193
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Electrophysiological repetition effects in persons with mild cognitive impairment depend upon working memory demand journal August 2018
Alpha desynchronization during simple working memory unmasks pathological aging in cognitively healthy individuals journal January 2019
Functional human GRIN2B promoter polymorphism and variation of mental processing speed in older adults journal April 2017
Tuning Up the Old Brain with New Tricks: Attention Training via Neurofeedback journal March 2017
Discriminating Fake From True Brain Injury Using Latency of Left Frontal Neural Responses During Old/New Memory Recognition journal September 2019
Acute Exercise Facilitates the N450 Inhibition Marker and P3 Attention Marker during Stroop Test in Young and Older Adults journal October 2018
Spared behavioral repetition effects in Alzheimer’s disease linked to an altered neural mechanism at posterior cortex journal February 2018

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