The Default Mode Network Supports Episodic Memory in Cognitively Unimpaired Elderly Individuals: Different Contributions to Immediate Recall and Delayed Recall

While the neural correlates of age-related decline in episodic memory have been the subject of much interest, the spontaneous functional architecture of the brain for various memory processes in elderly adults, such as immediate recall (IR) and delayed recall (DR), remains unclear. The present study...

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Bibliographic Details
Published in:Frontiers in aging neuroscience 2018-01, Vol.10, p.6-6
Main Authors: Huo, Lijuan, Li, Rui, Wang, Pengyun, Zheng, Zhiwei, Li, Juan
Format: Article
Language:English
Subjects:
Age
Aging
Auditory discrimination learning
Biomarkers
Brain
Brain architecture
Cognitive ability
Cortex (cingulate)
Cortex (parietal)
default mode network
delayed recall
Disease
functional connectivity
Geriatrics
immediate recall
Memory
Neural networks
Neuroscience
Older people
Parahippocampal gyrus
Prefrontal cortex
regional homogeneity
Retention
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Summary:While the neural correlates of age-related decline in episodic memory have been the subject of much interest, the spontaneous functional architecture of the brain for various memory processes in elderly adults, such as immediate recall (IR) and delayed recall (DR), remains unclear. The present study thus examined the neural correlates of age-related decline of various memory processes. A total of 66 cognitively normal older adults (aged 60-80 years) participated in this study. Memory processes were measured using the Auditory Verbal Learning Test as well as resting-state brain images, which were analyzed using both regional homogeneity (ReHo) and correlation-based functional connectivity (FC) approaches. We found that both IR and DR were significantly correlated with the ReHo of these critical regions, all within the default mode network (DMN), including the parahippocampal gyrus, posterior cingulate cortex/precuneus, inferior parietal lobule, and medial prefrontal cortex. In addition, DR was also related to the FC between these DMN regions. These results suggest that the DMN plays different roles in memory retrieval across different retention intervals, and connections between the DMN regions contribute to memory consolidation of past events in healthy older people.
ISSN:1663-4365
1663-4365
DOI:10.3389/fnagi.2018.00006