Alterations in the Relationship Between Hippocampal Volume and Episodic Memory Performance in Preterm Children

2013 ◽  
Vol 38 (4) ◽  
pp. 226-235 ◽  
Author(s):  
Nicole Brunnemann ◽  
Kerstin H. Kipp ◽  
Ludwig Gortner ◽  
Juliane Meng-Hentschel ◽  
Panagiotis Papanagiotou ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Memory Performance ◽  
Hippocampal Volume ◽  
Preterm Children ◽  
The Relationship

scholarly journals Grey and White Matter Pathways Underlying the Relationship Between Aerobically Active Lifestyle, Cardiorespiratory Function, and Episodic Memory in the Aging Human Brain

2020 ◽  
Author(s):  
Tamir Eisenstein ◽  
Nir Giladi ◽  
Ofer Havakuk ◽  
Yulia Lerner
Keyword(s):  
White Matter ◽  
Episodic Memory ◽  
Memory Performance ◽  
Hippocampal Volume ◽  
Active Lifestyle ◽  
Healthy Older Adults ◽  
Aerobic Activity ◽  
Cardiorespiratory Function ◽  
Microstructural Integrity ◽  
The Relationship

AbstractAging is associated with structural alterations of the hippocampus, a key region in episodic memory processes. Aerobic activity and maximal aerobic capacity (MAC), a key measure of cardiorespiratory function and a physiological adaptation of aerobic exercise, have been associated with biological and cognitive resilience of the brain. However, investigations of their relationship with the hippocampus in humans had resulted with inconsistent findings. This study aimed to investigate the relationship between lifestyle’s aerobic activity and MAC and hippocampal grey and white matter structure, as well as episodic memory performance in cognitively healthy older adults. In addition, we examined the relationship between aerobic activity and MAC, and cerebrovascular pathology expressed as white matter lesions (WML). Next, we used a regression-based mediation analysis to examine possible biological pathways which may underlie the relationship between MAC and hippocampal volume, which was demonstrated in previous works, and was confirmed in the current study. Fifty cognitively healthy older adults (70.92 ± 3.9 years) were divided into aerobically active (n=27) and non-active (n=23) groups, and performed structural and diffusion MRI. Forty-two participants were also evaluated for MAC. Aerobically active lifestyle and higher MAC were associated with increased hippocampal volume and microstructural integrity, as well as increased fornix microstructural integrity, and lower WML burden (p<.05). In addition, both factors were correlated with increased episodic memory performance (p<.05). Mediation analysis revealed two pathways potentially mediating the relationship between MAC, hippocampal volume, and episodic memory – a white matter pathway consisted of WML and fornix microstructure, and grey matter pathway including hippocampal microstructure. These findings shed light on possible neurobiological mechanisms that could potentially underlie the neuroprotective effect of cardiorespiratory function and aerobic physical activity on hippocampal macrostructure and memory function in the aging human brain.

scholarly journals SUBJECTIVE MEMORY COMPLAINTS AND COGNITIVE PERFORMANCE: THE MODERATING ROLE OF DEPRESSIVE SYMPTOMS

2019 ◽  
Vol 3 (Supplement_1) ◽  
pp. S654-S654
Author(s):  
Elizabeth A Gallagher
Keyword(s):  
Older Adults ◽  
Depressive Symptoms ◽  
Episodic Memory ◽  
Cognitive Performance ◽  
Memory Performance ◽  
Health Concern ◽  
Subjective Memory Complaints ◽  
Subjective Memory ◽  
Memory Complaints ◽  
The Relationship

Abstract Cognitive health is a rising public health concern in the U.S. Currently, approximately 5.7 million older adults suffer from Alzheimer’s disease (AD), and by the year 2050 this number is expected to increase to 14 million. Subjective memory complaints (SMC) are shown to be an early indicator of cognitive decline, and accordingly included as a clinical criterion for diagnoses of MCI, an indicator of pre-dementia states, and a research criterion for AD diagnoses. Among older adults, depressive symptoms hinder the accuracy of memory self-ratings. However, there has yet to be consensus regarding the nature of how depressive symptoms may condition the relationship between SMC and cognitive performance. The aims of the present study are to both investigate whether SMC is related to episodic memory and to determine whether depressive symptoms act as a moderator for the relationship between SMC and episodic memory among older adults. This research used nationally representative sample of 8,123 older adults aged 65 and older who completed the Leave Behind Questionnaire in the 2012 and 2014 waves of the Health and Retirement Study. Linear regression was performed and results showed that there was a significant main effect of SMC on episodic memory performance, in that older adults with increased SMC have worse episodic memory. There was also a significant moderating effect of depressive symptoms, in that depressive symptoms cause older adults to underestimate their memory abilities. In order to use SMC as a tool for early detection efforts it is critical to understand these complex relationships.

Spatial Visualization Ability Mediates the Male Advantage in Spatial and Visual Episodic Memory

2016 ◽  
Vol 37 (3) ◽  
pp. 194-200 ◽  
Author(s):  
Karen L. Siedlecki
Keyword(s):  
Episodic Memory ◽  
Verbal Memory ◽  
Visual Memory ◽  
Memory Performance ◽  
Spatial Visualization ◽  
Mediation Analyses ◽  
Female Advantage ◽  
Male Advantage ◽  
The Relationship ◽  
Verbal Episodic Memory

Abstract. Individuals between the ages of 18 and 94 (N = 326) completed a battery of episodic memory tasks, as well as several measures of spatial visualization. A female advantage in verbal episodic memory and a male advantage in spatial and visual episodic memory were observed. Mediation analyses provided evidence that performance on spatial visualization tasks greatly influences the magnitude of the effect for sex differences among the different episodic memory constructs. In particular, the spatial visualization construct fully mediated the relationship between sex and episodic spatial memory performance. Further, when spatial visualization was included as a mediator in the model the relationship between sex and episodic verbal memory increased, and the relationship between sex and episodic visual memory reversed, such that women scored higher than men.

scholarly journals The relationship between age, neural differentiation, and memory performance

2018 ◽  
Author(s):  
Joshua D. Koen ◽  
Nedra Hauck ◽  
Michael D. Rugg
Keyword(s):  
Episodic Memory ◽  
Neural Differentiation ◽  
Memory Performance ◽  
Younger Adults ◽  
Age Related ◽  
Cortical Regions ◽  
Age Related Cognitive Decline ◽  
Neural Selectivity ◽  
The Relationship ◽  
Differentiation Index

AbstractHealthy aging is associated with decreased neural selectivity (dedifferentiation) in category-selective cortical regions. This finding has prompted the suggestion that dedifferentiation contributes to age-related cognitive decline. Consistent with this possibility, dedifferentiation has been reported to negatively correlate with fluid intelligence in older adults. Here, we examined whether dedifferentiation is associated with performance in another cognitive domain – episodic memory – that is also highly vulnerable to aging. Given the proposed role of differentiation in age-related cognitive decline, we predicted there would be a stronger link between dedifferentiation and episodic memory performance in older than in younger adults. Young (18-30 yrs) and older (64-75 yrs) male and female humans underwent fMRI scanning while viewing images of objects and scenes prior to a subsequent recognition memory test. We computed a differentiation index in two regions-of-interest (ROIs): parahippocampal place area (PPA) and lateral occipital complex (LOC). This index quantified the selectivity of the BOLD response to an ROI’s preferred versus non-preferred category (scenes for PPA, objects for LOC). The differentiation index in the PPA, but not the LOC, was lower in older than in younger adults. Additionally, the PPA differentiation index predicted recognition memory performance for the studied items. This relationship was independent of and not moderated by age. The PPA differentiation index also predicted performance on a latent ‘fluency’ factor derived from a neuropsychological test battery; this relationship was also age invariant. These findings suggest that two independent factors, one associated with age, and the other with cognitive performance, drive neural differentiation.Significance StatementAging is associated with neural dedifferentiation – reduced neural selectivity in ‘category selective’ cortical brain regions – which has been proposed to mediate cognitive aging. Here, we examined whether neural differentiation is predictive of episodic memory performance, and whether the relationship is moderated by age. A neural differentiation index was estimated for scene-(PPA) and object-(LOC) selective cortical regions while participants studied images for a subsequent memory test. Age related reductions were observed for the PPA, but not the LOC, differentiation index. Importantly, the PPA differentiation index demonstrated age invariant correlations with subsequent memory performance and a fluency factor derived from a neuropsychological battery. Together, these findings suggest that neural differentiation is associated with two independent factors: age and cognitive performance.

scholarly journals Not what U expect: Effects of Prediction Errors on Episodic Memory.

2021 ◽  
Author(s):  
Javier Ortiz-Tudela ◽  
Sophie Nolden ◽  
Francesco Pupillo ◽  
Isabelle Ehrlich ◽  
Iryna Schommartz ◽  
...  
Keyword(s):  
Episodic Memory ◽  
Memory Performance ◽  
Prediction Errors ◽  
Apparent Paradox ◽  
Episodic Encoding ◽  
Important Challenge ◽  
The One ◽  
The Relationship ◽  
Strength Of Association

The characterization of the relationship between predictions and one-shot episodic encoding poses an important challenge for memory research. On the one hand, events that are compatible with our previous knowledge are thought to be remembered better than incompatible ones. On the other hand, unexpected situations, by virtue of their surprise, are known to cause enhanced learning. Several theoretical accounts try to solve this apparent paradox by conceptualizing prediction error (PE) as a continuum ranging from low PE (for expectation matching events) to high PE (for expectation mismatching ones). Under such framework, the relationship between PE and memory encoding would be described by a U-shape function with higher memory performance for extreme levels of PE and lower memory for middle levels of PE. In this study we used a gradual manipulation of the strength of association between scenes and objects to render different levels of PE and then tested for episodic memory of the (mis)matching events. In two experiments, and in contrast to what was anticipated, recognition memory as a function of PE followed an inverted U-shape, with higher performance for intermediate levels of PE. Furthermore, in two additional experiments we showed the relevance of explicit predictions at encoding to reveal such inverted U pattern, thus providing the boundary conditions of the effect. We discuss our current findings in the light of the uncertainty in the environment and the importance of the operations underlying encoding tasks.

The impact of hippocampal segmentation methods on correlations with clinical data

2019 ◽  
Vol 61 (7) ◽  
pp. 953-963
Author(s):  
Rowa Aljondi ◽  
Cassandra Szoeke ◽  
Chris Steward ◽  
Elaine Lui ◽  
Salem Alghamdi ◽  
...  
Keyword(s):  
Risk Factors ◽  
Cardiovascular Risk ◽  
Episodic Memory ◽  
Cardiovascular Risk Factors ◽  
Cholesterol Level ◽  
Memory Performance ◽  
Hdl Cholesterol ◽  
Hippocampal Volume ◽  
Segmentation Methods ◽  
Verbal Episodic Memory

Background In vivo measurement of hippocampal volume with magnetic resonance imaging (MRI) has become an important element in neuroimaging research. However, hippocampal volumetric findings and their relationship with cardiovascular risk factors and memory performance are still controversial and inconsistent for non-demented adults. Purpose To compare total and regional hippocampal volumes from manual tracing and automated Freesurfer segmentation methods and their relationship with mid-life clinical data and late-life verbal episodic memory performance in older women. Material and Methods This study used structural MRI datasets from 161 women who were scanned in 2012 and underwent neuropsychological assessments. Of these participants, 135 women had completed baseline measures of cardiovascular risk factors in 1992. Results Our results showed a significant correlation between manual tracing and automated Freesurfer output segmentations of total (r = 0.71), anterior (r = 0.65), and posterior (r = 0.38) hippocampal volumes. Mid-life Framingham Cardiovascular Risk Profile score is not associated with late-life hippocampal volumes, adjusted for intracranial volume, age, education, and apolipoprotein E gene ε4 status. Anterior hippocampal volume segmented either with manual tracing or automated Freesurfer software is sensitive to changes in mid-life high-density lipoprotein (HDL) cholesterol level, while posterior hippocampal volume is linked with verbal episodic memory performance in elderly women. Conclusion These findings support the use of Freesurfer automated segmentation measures for large datasets as being highly correlated with the manual tracing method. In addition, our results suggest intervention strategies that target mid-life HDL cholesterol level in women.

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