Accelerated Long-Term Forgetting: Prolonged Delayed Recognition as Sensitive Measurement for Different Profiles of
Nikki A Lammers1,2, Selma Lugtmeijer1,3, Edward H F de Haan1
1University of Amsterdam, Department of Brain and Cognition, Amsterdam, The Netherlands.
Summary
Accelerated long-term forgetting (ALF) affects 17% of stroke survivors, a rate higher than rapid forgetting (RF). A one-week memory test is crucial for detecting these memory deficits in stroke patients.
Area of Science:
- Neurology
- Cognitive Neuroscience
- Neuropsychology
Background:
- Episodic memory deficits are common following ischemic stroke.
- Standard clinical memory assessment uses a 20-30 minute delay, identifying rapid forgetting (RF).
- Accelerated long-term forgetting (ALF) describes memory decay over days/weeks, often missed by standard tests.
Purpose of the Study:
- To investigate the prevalence of ALF in stroke patients.
- To compare ALF and RF in stroke survivors.
- To evaluate the utility of prolonged memory testing in stroke patients.
Main Methods:
- Assessed episodic memory in 91 stroke patients and 85 controls at three time points: immediate (T1), short delay (20-30 min, T2), and prolonged delay (1 week, T3).
- Classified patients into groups based on forgetting patterns (no forgetting, RF, ALF) relative to controls.
- Collected confidence ratings for memory recall responses.
Main Results:
- Accelerated long-term forgetting (ALF) was identified in 17% of stroke patients.
- Rapid forgetting (RF) after a 20-30 minute delay was observed in 13% of patients.
- Patients reported lower confidence in their memory recall, irrespective of actual performance accuracy.
Conclusions:
- ALF is a significant issue in stroke survivors, more prevalent than RF.
- A one-week delayed memory assessment is valuable for detecting memory impairments in stroke patients that standard testing might miss.
- Memory confidence ratings may not accurately reflect objective memory performance in stroke patients.
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