scholarly journals Hippocampal and cortical mechanisms at retrieval explain variability in episodic remembering in older adults

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Alexandra N Trelle ◽  
Valerie A Carr ◽  
Scott A Guerin ◽  
Monica K Thieu ◽  
Manasi Jayakumar ◽  
...  
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Memory Decline ◽  
Cognitively Normal ◽  
Pattern Completion ◽  
Age Related ◽  
Hippocampal Activity ◽  
Fundamental Process ◽  
Individual Memory ◽  
The Relationship

Age-related episodic memory decline is characterized by striking heterogeneity across individuals. Hippocampal pattern completion is a fundamental process supporting episodic memory. Yet, the degree to which this mechanism is impaired with age, and contributes to variability in episodic memory, remains unclear. We combine univariate and multivariate analyses of fMRI data from a large cohort of cognitively normal older adults (N=100) to measure hippocampal activity and cortical reinstatement during retrieval of trial-unique associations. Trial-wise analyses revealed that (a) hippocampal activity scaled with reinstatement strength, (b) cortical reinstatement partially mediated the relationship between hippocampal activity and associative retrieval, (c) older age weakened cortical reinstatement and its relationship to memory behaviour. Moreover, individual differences in the strength of hippocampal activity and cortical reinstatement explained unique variance in performance across multiple assays of episodic memory. These results indicate that fMRI indices of hippocampal pattern completion explain within- and across-individual memory variability in older adults.

scholarly journals Hippocampal and cortical mechanisms at retrieval explain variability in episodic remembering in older adults

2020 ◽  
Author(s):  
Alexandra N. Trelle ◽  
Valerie A. Carr ◽  
Scott A. Guerin ◽  
Monica K. Thieu ◽  
Manasi Jayakumar ◽  
...  
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Multivariate Analyses ◽  
Memory Decline ◽  
Cognitively Normal ◽  
Pattern Completion ◽  
Age Related ◽  
Hippocampal Activity ◽  
Fundamental Process ◽  
Individual Memory

Age-related episodic memory decline is characterized by striking heterogeneity across individuals. Hippocampal pattern completion is a fundamental process supporting episodic memory. Yet, the degree to which this mechanism is impaired with age, and contributes to variability in episodic memory, remains unclear. We combine univariate and multivariate analyses of fMRI data from a large cohort of cognitively normal older adults (N=100; 60-82 yrs) to measure hippocampal activity and cortical reinstatement during retrieval of trial-unique associations. Trial-wise analyses revealed that hippocampal activity predicted cortical reinstatement strength, and these two metrics of pattern completion independently predicted retrieval success. However, increased age weakened cortical reinstatement and its relationship to memory behaviour. Critically, individual differences in the strength of hippocampal activity and cortical reinstatement explained unique variance in performance across multiple assays of episodic memory. These results indicate that fMRI indices of hippocampal pattern completion explain within- and across-individual memory variability in older adults.

P1-232: Subjective cognitive decline and Aβ status are associated with longitudinal episodic memory decline in cognitively normal older adults

2015 ◽  
Vol 11 (7S_Part_9) ◽  
pp. P441-P441
Author(s):  
Rachel F. Buckley ◽  
Paul Maruff ◽  
Kathryn A. Ellis ◽  
Lance Macaulay ◽  
Ralph N. Martins ◽  
...  
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Cognitive Decline ◽  
Subjective Cognitive Decline ◽  
Memory Decline ◽  
Cognitively Normal

scholarly journals Effects of Age Differences in Memory Formation on Neural Mechanisms of Consolidation and Retrieval

2020 ◽  
Author(s):  
Myriam C. Sander ◽  
Yana Fandakova ◽  
Markus Werkle-Bergner
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Age Differences ◽  
Cognitive Aging ◽  
Younger Adults ◽  
Memory Decline ◽  
Memory Processing ◽  
Memory Impairments ◽  
Age Related ◽  
Memory Network

Episodic memory decline is a hallmark of cognitive aging and a multifaceted phenomenon. We review studies that target age differences across different memory processing stages, i.e., from encoding to retrieval. The available evidence cumulates in the proposition that older adults form memories of lower quality than younger adults, which has negative downstream consequences for later processing stages. We argue that low memory quality in combination with age-related neural decline of key regions of the episodic memory network puts older adults in a double jeopardy situation that finally results in broader memory impairments in older compared to younger adults.

scholarly journals Healthy Aging diminishes the quantity (rate) and quality (precision) of episodic recollection.

2021 ◽  
Author(s):  
Jamie Murray ◽  
David Donaldson
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Memory Retrieval ◽  
Healthy Aging ◽  
Significant Decline ◽  
Younger Adults ◽  
Memory Decline ◽  
Age Related ◽  
Insight Into ◽  
Test Delay

Healthy aging leads to a significant decline in episodic memory, producing a reduction in thelikelihood of successful recollection, such that older adults remember less than younger adults.Emerging evidence from behavioral and neuroimaging studies demonstrate that recollectedinformation can also be more or less precise, highlighting a source of variability in memoryperformance not typically considered in studies of aging. Consequently, it is unknown whetherolder adults, compared to younger adults, only show a significant reduction in recollection rate or also exhibit a decline in recollection precision. Here, we provide new insight into age-relatedmemory decline by employing a novel source task that allows us to examine both the quantity(rate) and quality (precision) of episodic memory retrieval. First, we validated our task,demonstrating that it can effectively capture variability in both the rate and precision in olderadults. Second, we directly compared younger and older adults’ performance as a function ofstudy-test delay, showing significant reductions in both the rate and precision of recollectionwith age. Finally, we asked whether age-related changes in recollection can be accounted for bya reduction in attention, revealing that the division of attention in young adults results in areduction in rate but shows little evidence for a change in precision. Our results raise questionsabout the nature of age-related memory decline, highlighting the importance of measuring boththe quality and quantity of memory, and suggest new routes to achieve the early detection anddiagnosis of abnormal aging deficits.

scholarly journals Age-related Decline in Associative Memory: Understanding the Roles of Controlled and Automatic Processes

2018 ◽  
Author(s):  
Jimmy Y. Zhong
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Associative Memory ◽  
Automatic Processes ◽  
Memory Decline ◽  
Current Review ◽  
Age Related ◽  
Associative Deficit ◽  
Contextual Elements ◽  
Episodic Memories

Memory decline in old age is highly noticeable based on tasks assessing episodic memory, which require remembering information about events at specific times and places. The exact cognitive mechanism that accounts for this prominent age-related decline in episodic memory has not been well-understood, and the multitude of mechanisms that were proposed have drawn a credible amount of research and discussions. The current review focuses on the associative deficit hypothesis (ADH) - originally proposed by Naveh-Benjamin and colleagues - that was suggested to form the basis of age-related declines in episodic memories. According to the ADH, older adults’ poorer episodic memory is attributed to the difficulties they experience in formulating relations or links between single units of information (i.e., items or contextual elements), binding them together into a coherent distinctive unit, and retrieving the links between the component features/units whenever necessary [COPYRIGHT CC-BY-NC-ND 4.0 J. Y. ZHONG, 2018].

Combined genetic influences on episodic memory decline in older adults without dementia.

2020 ◽  
Vol 34 (6) ◽  
pp. 654-666 ◽  
Author(s):  
Erika J. Laukka ◽  
Ylva Köhncke ◽  
Goran Papenberg ◽  
Laura Fratiglioni ◽  
Lars Bäckman
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Genetic Influences ◽  
Memory Decline

scholarly journals Coping Capacity and Episodic Memory in Older Adults With SMCs: The Mediating Role of Healthy Lifestyle

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. 278-279
Author(s):  
Feilong Wang ◽  
Shijie Li ◽  
Kaifa Wang ◽  
Yanni Yang
Keyword(s):  
Older Adults ◽  
Episodic Memory ◽  
Healthy Lifestyle ◽  
Community Dwelling ◽  
Mediating Effect ◽  
Equation Modeling ◽  
Coping Capacity ◽  
Memory Decline ◽  
Mediating Role

Abstract Older adults with subjective memory complaints (SMCs) are at increased risk for episodic memory decline. Episodic memory decline is an important predictor of objective memory impairment (one of the earliest symptoms of Alzheimer’s disease) and an often-suggested criterion of successful memory aging. Therefore, it is important to explore the determinant factors that influence episodic memory in older adults with SMCs. Roy adaptation model and preliminary evidence suggest that older adults with SMCs undergo a coping and adaptation process, a process influenced by many health-related risks and protective factors. This study aimed to explore the relationship between coping capacity and episodic memory, and the mediating role of healthy lifestyle between coping capacity and episodic memory in a sample of 309 community-dwelling older adults with SMCs. Results from the structural equation modeling showed that coping capacity directly affects episodic memory (r=0.629, p＜0.001), and there is a partial mediating effect (60.5%) of healthy lifestyle among this sample of older adults with SMCs. This study demonstrates that coping capacity and adaptation positively correlate with episodic memory in older adults with SMCs, and that these correlations are mediated by healthy lifestyle. The results suggest that older adults with poor coping capacity should be assessed and monitored regularly, and clear lifestyle-related interventions initiated by healthcare providers that promote healthy lifestyles may effectively improve coping capacity and episodic memory in this population group. Note: First author: Feilong Wang, Co-first author: Shijie li, Corresponding author: Yanni Yang

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