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Mild cognitive impairment can be detected by multiple assessments in a single day
1Neuropsychology Laboratory, Mental Health Research Institute of Victoria, Parkville, Australia. ddarby@cogstate.com
Background:
Reliable detection of mild cognitive impairment (MCI), in many cases preceding AD, is important in determining the efficacy of emerging treatments. The operational definition of MCI is currently imprecise and would be improved by objective criteria. Inherent in the transition from MCI to AD is cognitive decline, which can be detected using multiple assessments over several years.
Objective:
To determine whether multiple assessments on the same day could also differentiate well-studied subjects with very mild MCI from normal control subjects.
Methods:
This study utilized a novel 15- to 18-minute computerized cognitive battery designed for frequent serial use, administered four times within 3 hours. Subjects were participants in a longitudinal healthy aging study (20 with MCI, 40 control subjects matched for age, gender, and education).
Results:
The MCI group showed significantly attenuated learning performance with repetition on accuracy and reaction time tasks. Discriminant function analysis correctly classified 95% of subjects and 80% of those with MCI.
Conclusions:
Multiple assessments with standardized, repeatable cognitive measures is a promising method for reliably differentiating patients with early MCI in a single test session and deserves further study for refining patient selection in trials of therapeutic agents for MCI.
Insights
This study shows that repeated cognitive assessments within hours can reliably detect mild cognitive impairment (MCI). This method accurately differentiates individuals with very mild MCI from healthy controls, aiding early diagnosis.
Area of Science:
- Neuroscience
- Gerontology
- Cognitive Psychology
Background:
- Mild cognitive impairment (MCI) often precedes Alzheimer's disease (AD), necessitating reliable detection methods for treatment efficacy.
- Current MCI definitions lack precision, highlighting the need for objective diagnostic criteria.
- Cognitive decline is a hallmark of MCI progression to AD, detectable through longitudinal assessments.
Purpose of the Study:
- To assess if multiple cognitive assessments on the same day can distinguish individuals with very mild MCI from normal controls.
- To validate a novel computerized cognitive battery for frequent serial administration.
Main Methods:
- A 15- to 18-minute computerized cognitive battery was administered four times within a 3-hour period.
- The study included 20 participants with MCI and 40 age-, gender-, and education-matched control subjects from a healthy aging study.
Main Results:
- The MCI group exhibited significantly impaired learning performance and slower reaction times compared to controls.
- Discriminant function analysis achieved 95% overall classification accuracy, correctly identifying 80% of MCI subjects.
Conclusions:
- Standardized, repeatable cognitive measures administered multiple times in one session show promise for reliably differentiating early MCI.
- This approach could refine patient selection for clinical trials targeting MCI therapies.
- Further research is warranted to validate this method for early MCI detection.