Relating pessimistic memory predictions to Alzheimer's disease brain structure
Sarah Genon1, Jessica Simon2, Mohamed Ali Bahri2
1GIGA-CRC In Vivo Imaging, University of Liège, Belgium; Institute of Neuroscience und Medicine (INM-1), Research Centre Juelich, Juelich, Germany.
Summary
Patients with Alzheimer's disease (AD) exhibit impaired memory monitoring. This study found that AD patients often incorrectly predict memory failure, even for correct recalls, linked to reduced gray matter volume in specific brain regions.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Alzheimer's disease (AD) is characterized by deficits in episodic memory and metacognition.
- Metacognitive impairments in AD patients affect their ability to accurately monitor their own memory performance.
Purpose of the Study:
- To investigate subjective metacognitive judgments before memory retrieval in AD patients.
- To explore the neural correlates of pessimistic predictions for successful memory retrieval in AD.
Main Methods:
- AD patients and healthy older adults provided predictive judgments of recognition performance for semantic and episodic memory tasks.
- Gray matter volume (GMV) correlations with behavioral scores were analyzed using partial least square (PLS) and general linear model (GLM).
Main Results:
- AD patients frequently exhibited pessimistic predictions for correctly recognized episodic memories.
- PLS analysis linked this pattern to reduced GMV in the right medial temporal lobe, posterior cingulate cortex (PCC), and ventrolateral prefrontal cortex (VLPFC).
- GLM confirmed a negative correlation between pessimistic prediction and VLPFC GMV.
Conclusions:
- Impaired memory monitoring in AD patients, potentially due to inaccurate self-beliefs, is associated with decreased GMV in the VLPFC.
- These findings highlight the neural basis of metacognitive deficits in Alzheimer's disease.
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