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Memory evaluation in mild cognitive impairment using recall and recognition tests
Ilana J Bennett1, Edward J Golob, Elizabeth S Parker
1Department of Neurology, University of California, Irvine, USA.
Abstract:
Amnestic mild cognitive impairment (MCI) is a selective episodic memory deficit that often indicates early Alzheimer's disease. Episodic memory function in MCI is typically defined by deficits in free recall, but can also be tested using recognition procedures. To assess both recall and recognition in MCI, MCI (n = 21) and older comparison (n = 30) groups completed the USC-Repeatable Episodic Memory Test. Subjects memorized two verbally presented 15-item lists. One list was used for three free recall trials, immediately followed by yes/no recognition. The second list was used for three-alternative forced-choice recognition. Relative to the comparison group, MCI had significantly fewer hits and more false alarms in yes/no recognition, and were less accurate in forced-choice recognition. Signal detection analysis showed that group differences were not due to response bias. Discriminant function analysis showed that yes/no recognition was a better predictor of group membership than free recall or forced-choice measures. MCI subjects recalled fewer items than comparison subjects, with no group differences in repetitions, intrusions, serial position effects, or measures of recall strategy (subjective organization, recall consistency). Performance deficits on free recall and recognition in MCI suggest a combination of both tests may be useful for defining episodic memory impairment associated with MCI and early Alzheimer's disease.
Insights
Mild cognitive impairment (MCI) affects episodic memory, often signaling early Alzheimer's disease. Recognition tests, particularly yes/no recognition, are more sensitive than free recall for detecting these memory deficits in MCI patients.
Area of Science:
- Neurology
- Cognitive Science
- Psychology
Background:
- Amnestic mild cognitive impairment (MCI) is characterized by episodic memory deficits.
- These deficits are often indicative of early-stage Alzheimer's disease.
- Episodic memory impairment in MCI is typically assessed through free recall, but recognition procedures offer alternative diagnostic avenues.
Purpose of the Study:
- To evaluate and compare the effectiveness of free recall and different recognition tasks in identifying episodic memory deficits in individuals with MCI.
- To determine which memory assessment method best distinguishes MCI patients from healthy older adults.
Main Methods:
- The study involved two groups: individuals with MCI (n=21) and a comparison group of older adults (n=30).
- Participants completed the USC-Repeatable Episodic Memory Test, involving memorization of verbal lists.
- Memory was assessed using free recall, yes/no recognition, and three-alternative forced-choice recognition tasks.
Main Results:
- Individuals with MCI demonstrated significantly poorer performance on both yes/no recognition (fewer hits, more false alarms) and forced-choice recognition compared to the control group.
- Signal detection analysis confirmed that observed group differences were not attributable to response bias.
- Discriminant function analysis indicated that yes/no recognition was the most effective measure in differentiating between MCI and control groups, outperforming free recall and forced-choice recognition.
Conclusions:
- MCI is associated with significant deficits in both recall and recognition aspects of episodic memory.
- Yes/no recognition tasks appear to be more sensitive indicators of episodic memory impairment in MCI than free recall or forced-choice recognition.
- Combining free recall and recognition measures may provide a more comprehensive assessment of episodic memory impairment in the context of MCI and early Alzheimer's disease.
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