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2.
Age Ageing ; 53(5)2024 May 01.
Article En | MEDLINE | ID: mdl-38706392

Cognitive decline, mental health and mindset factors can all affect the autonomy and well-being of older adults. As the number of older adults across the globe increases, interventions to improve well-being are urgently needed. Improvisational theatre (improv) and improv-based interventions are well-suited to address this need. Studies have shown that participation in improv-based interventions has a positive impact on mental health indicators, including depressive symptoms, well-being and social connectedness, as well as cognitive skills such as attention and memory. In addition, improv-based interventions have been beneficial for people with dementia, improving positive affect, self-esteem and communication. In this article, we describe improvisational theatre, or improv, and the reasons it has emerged from a form of spontaneous theatre that involves playfulness and creativity to an important tool to effect behavioural change in individuals and groups. We then review the literature on the effects of improv in ageing populations, with a focus on social, emotional and cognitive functioning. Finally, we make recommendations on designing improv-based interventions so that future research, using rigorous quantitative methods, larger sample sizes and randomised controlled trials, can expand the use of improv in addressing important factors related to autonomy and well-being in older adults.


Aging , Mental Health , Humans , Aging/psychology , Aged , Cognition , Creativity , Age Factors , Personal Autonomy , Emotions , Healthy Aging/psychology
3.
Neurosci Biobehav Rev ; 161: 105649, 2024 Jun.
Article En | MEDLINE | ID: mdl-38579902

With dementia incidence projected to escalate significantly within the next 25 years, the United Nations declared 2021-2030 the Decade of Healthy Ageing, emphasising cognition as a crucial element. As a leading discipline in cognition and ageing research, psychology is well-equipped to offer insights for translational research, clinical practice, and policy-making. In this comprehensive review, we discuss the current state of knowledge on age-related changes in cognition and psychological health. We discuss cognitive changes during ageing, including (a) heterogeneity in the rate, trajectory, and characteristics of decline experienced by older adults, (b) the role of cognitive reserve in age-related cognitive decline, and (c) the potential for cognitive training to slow this decline. We also examine ageing and cognition through multiple theoretical perspectives. We highlight critical unresolved issues, such as the disparate implications of subjective versus objective measures of cognitive decline and the insufficient evaluation of cognitive training programs. We suggest future research directions, and emphasise interdisciplinary collaboration to create a more comprehensive understanding of the factors that modulate cognitive ageing.


Cognition , Healthy Aging , Humans , Healthy Aging/physiology , Healthy Aging/psychology , Cognition/physiology , Cognitive Dysfunction/physiopathology , Cognitive Reserve/physiology , Aging/physiology , Cognitive Aging/physiology
4.
PLoS One ; 19(4): e0302103, 2024.
Article En | MEDLINE | ID: mdl-38656961

Natural language use is a promising candidate for the development of innovative measures of well-being to complement self-report measures. The type of words individuals use can reveal important psychological processes that underlie well-being across the lifespan. In this preregistered, cross-sectional study, we propose a conceptual model of language markers of well-being and use written narratives about healthy aging (N = 701) and computerized text analysis (LIWC) to empirically validate the model. As hypothesized, we identified a model with three groups of language markers (reflecting affective, evaluative, and social processes). Initial validation with established self-report scales (N = 30 subscales) showed that these language markers reliably predict core components of well-being and underlying processes. Our results support the concurrent validity of the conceptual language model and allude to the added benefits of language-based measures, which are thought to reflect less conscious processes of well-being. Future research is needed to continue validating language markers of well-being across the lifespan in a theoretically informed and contextualized way, which will lay the foundation for inferring people's well-being from their natural language use.


Healthy Aging , Language , Humans , Female , Male , Aged , Healthy Aging/psychology , Healthy Aging/physiology , Cross-Sectional Studies , Middle Aged , Narration , Aged, 80 and over , Self Report
5.
Womens Health (Lond) ; 20: 17455057241247747, 2024.
Article En | MEDLINE | ID: mdl-38682301

BACKGROUND: The United Nations has declared 2021-2030 the 'Decade of Healthy Ageing' and identified the need to strengthen the evidence base on interpretations and determinants of healthy ageing to inform policy. OBJECTIVES: This study sought to interrogate a 'policy blind spot' and examine interpretations and experiences of sexuality and sexual health within the context of ageing well among women aged 50+. DESIGN: The qualitative study design was underpinned by an interpretivist epistemology. Research was guided by principles of feminist scholarship and located in an affirmative ageing framework. METHODS: Semi-structured individual interviews were conducted between April-June 2019 with 21 English-speaking women aged 52-76. Women were recruited through community organizations in North West England. Transcripts were analysed using a framework approach to thematic analysis, applying an inductive approach to theme generation. RESULTS: Narratives encompassed six broad themes: reflections on 'ageing well'; age alone does not define sexuality and sexual health; interpretations of sexual health and sexuality; vulnerability and resistance in later-life sexual health; narratives of (in)visibility; and reimagining services to promote sexual health in later life. There was a dominant belief that sexual health represents a component of ageing well, despite a broad spectrum of sexual expression and health challenges. Sexual expression was diversely shaped by conflicting societal expectations within an evolving digitized environment. In clinical settings, however, sexual health discussions were often muted or framed from a disease-focussed lens. Women expressed a preference for holistic, person-centred sexual health provision from an orientation of wellness to support varied sexual expression, sensitive to wider health, life and relationship realities. CONCLUSION: This work strengthens calls to disentangle sexual health from disease-centred narratives and legitimize sexual health as part of the healthy ageing agenda.


Aging , Qualitative Research , Sexual Health , Humans , Female , Middle Aged , Aged , Aging/psychology , England , Healthy Aging/psychology , Love , Interviews as Topic , Sexuality/psychology , Sexual Behavior
6.
J Cross Cult Gerontol ; 39(2): 107-123, 2024 Jun.
Article En | MEDLINE | ID: mdl-38441785

Predominantly Western-based biomedical models of successful aging have been used to research, understand, and explain successful aging among diverse populations. With an increasingly heterogeneous older adult population nationwide, scholars have been exploring Indigenous understandings of successful aging. To add to the accumulation of knowledge of diverse Alaska Native populations, this study involved semi-structured qualitative interviews with 20 Unangan Elders from the Aleutian and Pribilof Islands. This community-based participatory research study explores the aging experiences and conceptualization of successful aging of these Elders from this remote and culturally distinct region of Alaska. Thematic analysis was employed to identify themes related to successful aging within this specific region, which supported our previous four themes, or characteristics, of Alaska Native successful aging: physical health, social support and emotional well-being, generativity as a traditional way of life, and community engagement and Inidgenous cultural generativity. Each of these themes or characteristics of Eldership is intertwined and together support successful aging within two remote communities in the Bering Sea. The findings of this study illuminate how Alaska Native Elders can live in geographically diverse regions of the State, yet the values and teachings they possess on successful aging possess the same cultural values and teachings. This study highlighted two new emerging constructs that influence Alaska Native Elders' successful aging based on geographical location. Findings contribute to the thematic saturation of the four main successful aging domains while outlining the importance of future research to conduct deeper investigations into the role of environment and history on Elders' perceptions and understanding of aging.


Aging , Alaska Natives , Community-Based Participatory Research , Qualitative Research , Social Support , Humans , Aged , Female , Male , Alaska , Alaska Natives/psychology , Aging/psychology , Aging/ethnology , Aged, 80 and over , Interviews as Topic , Middle Aged , Healthy Aging/psychology , Health Status
7.
Arch Gerontol Geriatr ; 122: 105371, 2024 Jul.
Article En | MEDLINE | ID: mdl-38471410

INTRODUCTION: Functional decline, chronic illness, reduced quality of life and increased healthcare utilisation are common in older adults. Evidence suggests music and dance can support healthy ageing in older adults. This study explored the feasibility, potential for effect and cost effectiveness of the Music and Movement for Health (MMH) programme among community-dwelling older adults using a pragmatic cluster-randomised, controlled feasibility trial design. METHODS: Community-dwelling adults aged 65 years or older were recruited to seven clusters in the Mid-West region of Ireland. Clusters were block randomised to either the MMH intervention or control. Primary feasibility outcomes included recruitment, retention, adherence, fidelity, and safety. Secondary outcomes measured physical activity, physical and cognitive performance, and psychosocial well-being, along with healthcare utilisation were assessed at baseline and after 12 weeks. RESULTS: The study successfully met feasibility targets, with recruitment (n = 100), retention (91 %), adherence (71 %), data completeness (92 %) and intervention fidelity (21 out of 24) all meeting predetermined criteria. Both groups exhibited an increase in self-reported physical activity and improved physical function. Participants in the intervention group scored consistently better in psychosocial measures compared to the control group at follow-up. The health economic analysis confirmed the feasibility of the methodology employed and points to the potential cost-effectiveness of the MMH relative to the control or no organised programme. DISCUSSION AND IMPLICATIONS: The MMH intervention and study design were found to be feasible and acceptable with important findings to inform future evaluation of the clinical and cost-effectiveness of a definitive randomised controlled trial.


Feasibility Studies , Independent Living , Humans , Aged , Male , Female , Music Therapy/methods , Quality of Life , Dancing/psychology , Exercise , Cost-Benefit Analysis , Ireland , Aged, 80 and over , Dance Therapy/methods , Healthy Aging/psychology
8.
Neurol Sci ; 45(6): 2605-2613, 2024 Jun.
Article En | MEDLINE | ID: mdl-38253743

BACKGROUND: The Rey's 15 words test is currently the most frequently used task in Italy to detect memory deficits in AD. The current standardised version is however quite outdated and lacks some cognitive indexes which may highlight problems in recall or encoding processes. The aim of the study was to update the normative data of the test and to consider some variables which were not accounted for in the original study, that is, recognition, learning rate and forgetfulness. We also adopted the process scores approach to ascertain the effects of serial position (primacy and recency). METHODS: Three hundred ninety-six healthy participants were recruited. To detect any variables useful for intercepting the early stages of dementia, a group of 208 patients in the very early stage of AD was also recruited. Linear models were used to calculate the corrections scores for age, education, and gender, and ROCs were used to calculate cut-offs based on the maximum sum of sensitivity and specificity and the positive and negative predictive values. RESULTS: All main indexes showed excellent Area Under the Curve (0.90-1), strong sensitivity and PPVs for distinguishing between the HCs and AD participants. However, the Intrusions index performed poorly in all parameters. CONCLUSION: The study provides updated, normative data which may be reliably used as a cognitive marker to detect early AD. The strength of the study is the large sample size and the number of indexes which make it possible to explore the utility of memory test process scores.


Alzheimer Disease , Healthy Aging , Humans , Female , Male , Alzheimer Disease/diagnosis , Aged , Middle Aged , Aged, 80 and over , Healthy Aging/physiology , Healthy Aging/psychology , Neuropsychological Tests/standards , Reference Values , Adult , Sensitivity and Specificity , Memory Disorders/diagnosis
9.
Int J Qual Stud Health Well-being ; 18(1): 2253576, 2023 Dec.
Article En | MEDLINE | ID: mdl-37691478

South Asians are the largest and fastest-growing racialized group in Canada, yet there are limited data on various aspects of health and well-being within this population. This includes the South Asian older adults' ethnoculturally informed perceptions of ageing. The study aimed to understand how social and cultural forces impact the meaning assigned to healthy ageing amongst older South Asians in Canada. We recruited with purposeful and snowball sampling strategies in Southern Ontario. We conducted in-depth focus group and individual interviews (n = 19) in five South Asian languages, employing a multilingual and cross-cultural qualitative approach. In our analysis, we identified three central themes: (a) taking care of body (b) taking care of mind and heart and (c) healthy ageing through the integration of mind and body. Our study demonstrates that older immigrants are a diverse and heterogeneous population and that their conception of healthy ageing is strongly influenced by their country of origin. This study also demonstrates how racialized foreign-born older adults might provide distinctive perspectives on the ageing process and on social theories of ageing due to their simultaneous immersion in and belonging to global majority and global minority cultures. This research also adds to the limited body of literature on the theories of ageing, despite migration trends, still has a white-centric lens.


Emigrants and Immigrants , Healthy Aging , South Asian People , Aged , Humans , Aging , Asian People/psychology , Healthy Aging/ethnology , Healthy Aging/psychology , Minority Groups/psychology , Ontario/epidemiology , South Asian People/psychology , Asia, Southern/ethnology , Emigrants and Immigrants/psychology
10.
Archiv. med. fam. gen. (En línea) ; 20(2): 11-18, jul. 2023.
Article Es | LILACS | ID: biblio-1524066

Contexto: El envejecimiento de la población plantea varias cuestiones fundamentales. ¿Cómo podemos ayudar a las personas a que sigan siendo independientes y activas a medida que envejecen? El Proyecto de Vida es un concepto que ha estado vinculado a la necesidad del ser humano de buscar su bienestar. Puede pensarse que, si una persona cuenta con un proyecto de vida preconcebido, al llegar a la vejez su tiempo estará orientado a continuar con metas previamente visualizadas. Objetivo: Conocer la opinión de los adultos sobre su proyecto de vida para la vejez en un área urbana de Tucumán. Metodología: Se realizó un estudio cualitativo desde un abordaje fenomenológico. Los sujetos estudiados fueron adultos entre 45-59 años, de ambos sexos. Se constituyeron dos grupos focales. Resultados: se obtuvieron las siguientes categorías descriptivas: "Un callejón ¿con salida?", "Descartados y desechos", "Encaminarnos a la vejez", "Revolución de la longevidad", "Un poco de esto, un poco de aquello". Conclusión: Este estudio evidenció las opiniones que tiene un grupo de adultos de Tucumán sobre proyectos de vida para la vejez, identificándose cómo el fenómeno de ageísmo influye en su proyección a futuro. Se vio la importancia de repensar la vejez sin la estigmatización o discriminación social, considerando acompañar activamente a la población en edad prejubilatoria (AU)


Context: The aging of the population raises several fundamental questions. How can we help people to remain independent and active as they age? The Life Project is a concept that has been linked to the need of human beings to seek their well-being. It may be thought that if a person has a preconceived life project, when they reach old age their time will be oriented to continue with previously visualized goals. Objective: To know the opinion of adults about their life project for old age in an urban area of Tucumán. Methodology: A qualitative study was carried out from a phenomenological approach. The subjects studied were adults between 45-59 years old, of both sexes. Two focus groups were formed. Results: the following descriptive categories were obtained: "An alley with an exit?", "Discarded and discarded", "Towards old age", "Longevity revolution", "A little of this, a little of that". Conclusion: This study evidenced the opinions that a group of adults from Tucumán have about life projects for old age, identifying how the phenomenon of ageism influences their future projection. The importance of rethinking old age without stigmatization or social discrimination was seen, considering actively accompanying the pre-retirement age population (AU)


Humans , Male , Female , Middle Aged , Aging , Projects , Longevity , Middle Aged , Healthy Aging/psychology
11.
J Psychosom Res ; 170: 111346, 2023 07.
Article En | MEDLINE | ID: mdl-37148605

OBJECTIVE: Sense of purpose in life has been linked with better physical health, longevity, and reduced risk for disability and dementia, but the mechanisms linking sense of purpose with diverse health outcomes are unclear. Sense of purpose may promote better physiological regulation in response to stressors and health challenges, leading to lower allostatic load and disease risk over time. The current study examined the association between sense of purpose in life and allostatic load over time in adults over age 50. METHODS: Data from the nationally representative US Health and Retirement Study (HRS) and English Longitudinal Study of Ageing (ELSA) were used to examine associations between sense of purpose and allostatic load across 8 and 12 years of follow-up, respectively. Blood-based and anthropometric biomarkers were collected at four-year intervals and used to compute allostatic load scores based on clinical cut-off values representing low, moderate, and high risk. RESULTS: Population-weighted multilevel models revealed that sense of purpose in life was associated with lower overall levels of allostatic load in HRS, but not in ELSA after adjusting for relevant covariates. Sense of purpose in life did not predict rate of change in allostatic load in either sample. CONCLUSIONS: The present investigation supports sense of purpose predicting preserved differentiation of allostatic regulation, with more purposeful individuals demonstrating consistently lower allostatic load over time. Persistent differences in allostatic burden may account for divergent health trajectories between individuals low and high in sense of purpose.


Aging , Allostasis , Goals , Aged , Female , Humans , Male , Middle Aged , Aging/physiology , Aging/psychology , Allostasis/physiology , Biomarkers , England , Health Behavior , Healthy Aging/physiology , Healthy Aging/psychology , Longitudinal Studies , Mental Health/statistics & numerical data , Retirement/psychology , Stress, Physiological/physiology , Stress, Psychological/physiopathology , United States
12.
Article En | MEDLINE | ID: mdl-35345965

Accumulating research suggests that individuals with Mild Cognitive Impairment (MCI) experience subtle functional changes, but that available functional assessment tools are insensitive to this. To address this gap, we describe the development and validation of the self-report, "Healthy Brain Ageing Functional Assessment Questionnaire" (HBA-FAQ). We examined the factor structure and psychometric properties of the HBA-FAQ in 503 participants with normal cognition, subjective cognitive decline (SCD), MCI or dementia. Our results found the HBA-FAQ to have good reliability, validity and stronger discriminative ability between healthy control participants and those with SCD (0.734, p = .001), MCI (0.666, p = .012) and dementia (0.798, p < .001) compared to a widely-used instrumental activities of daily living screener. In conclusion, the HBA-FAQ is a valid, reliable self-report tool, providing an efficient and sensitive approach to identifying subtle changes in daily functioning in older people at risk of dementia.


Brain , Cognitive Dysfunction , Health Surveys , Healthy Aging , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Brain/physiopathology , Case-Control Studies , Cognitive Dysfunction/diagnosis , Cognitive Dysfunction/physiopathology , Cognitive Dysfunction/psychology , Dementia/diagnosis , Dementia/physiopathology , Dementia/psychology , Health Surveys/methods , Health Surveys/standards , Healthy Aging/physiology , Healthy Aging/psychology , Psychometrics , Reproducibility of Results , Self Report
13.
Clin Interv Aging ; 17: 1569-1580, 2022.
Article En | MEDLINE | ID: mdl-36304176

Background: The World Health Organization has conceptualised the health and healthcare of older adults around the concept of healthy ageing. Healthy ageing is defined as "the process of developing and maintaining the functional ability that enables well-being in older age". This functional ability is the sum of two key factors: intrinsic capacity and interacting environment. This concept of intrinsic capacity encompasses a wide spectrum of health characteristics including the physiological and psychological changes associated with the ageing process. In general, IC declines from a high and stable state to an impaired status as people age. Monitoring individuals for changes in intrinsic capacity in the context of their environment will provide a holistic method of tracking the functioning of older adults at both a population and individual level, providing an opportunity to address any reversible factors of decline. However, this would require a clear and objective conceptualisation of the concept of intrinsic capacity. Methodology: One hundred subjects were recruited via invitation by advertisement on the institute campus. Study participants underwent detailed physical examination and measurement of various physical and chemical biomarkers which were likely to represent intrinsic capacity as evidenced by the literature review. Outcomes measured were a decline in ADL, IADL, mortality and hospitalisation over a follow-up period of six months. Exploratory factor analysis (EFA) was done to obtain a clinical construct of the proposed entity of intrinsic capacity. Unpaired t-test and univariate logistic regression were used to check for the association between the composite score (IC) and its domains with the decline in ADL, IADL, mortality and hospitalisation. Results: One composite score (composite IC score) and eight subfactors emerged. The composite score and subfactor domains showed good construct validity. Composite intrinsic capacity score and subdomains of strength and cognition were significantly different among subjects with and without ADL and IADL decline. Univariate logistic regression showed that composite intrinsic capacity score was a predictor of decline in ADL and IADL even after adjusting for age, sex, comorbidity status and education level of the subject with an adjusted odds ratio of 0.99 and 0.98, respectively. Subdomains of strength and cognition also predicted a decline in ADL and IADL independently. Conclusion: The development of an objective construct of the concept of intrinsic capacity, using commonly measured clinical and biochemical parameters, is feasible and predictive of the subsequent functionality of an individual.


Activities of Daily Living , Cognitive Dysfunction , Healthy Aging , Aged , Female , Humans , Male , Activities of Daily Living/psychology , Healthy Aging/physiology , Healthy Aging/psychology , Logistic Models , Cognitive Dysfunction/diagnosis , Cognitive Dysfunction/physiopathology , Predictive Value of Tests
15.
J Gerontol B Psychol Sci Soc Sci ; 77(3): 536-549, 2022 03 03.
Article En | MEDLINE | ID: mdl-34265038

OBJECTIVES: Theoretical and empirical evidence suggests the existence of a general perceived stress factor overarching different life domains. The present study investigated the general perceived stress relative to domain-specific perceived stress as predictors of 26 diverse health outcomes, including mental and physical health, health behaviors, cognitive functioning, and physiological indicators of health. METHOD: A bifactor exploratory structural equational modeling approach was adopted in 2 aging samples from the Health and Retirement Study (N = 8,325 in Sample 1 and N = 7,408 in Sample 2). RESULTS: Across the 2 samples, perceived stress was well represented by a bifactor structure where there was a robust general perceived stress factor representing a general propensity towards stress perception. Meanwhile, after controlling for the general perceived stress factor, specific factors that represent perceived stress in different life domains were still clearly present. Results also suggested age, sex, race, education, personality traits, and past and recent stressor exposure as possible factors underlying individual differences in the general perceived stress factor. The general perceived stress factor was the most robust predictor of the majority of health outcomes, as well as changes in mental health outcomes. The specific factor of perceived neighborhood stress demonstrated incremental predictive effects across different types of health outcomes. DISCUSSION: The current study provides strong evidence for the existence of a general perceived stress factor that captures variance shared among stress across life domains, and the general perceived stress factor demonstrated substantial prospective predictive effects on diverse health outcomes in older adulthood.


Healthy Aging , Aged , Aging/psychology , Healthy Aging/psychology , Humans , Prospective Studies , Retirement , Stress, Psychological/psychology
16.
J Gerontol A Biol Sci Med Sci ; 77(2): e65-e73, 2022 02 03.
Article En | MEDLINE | ID: mdl-34125189

BACKGROUND: Despite growing research on the association between discrimination and disparities in cognitive aging, an evidence gap remains on how the association varies by racial/ethnic group. This study evaluates the associations of experiences of discrimination with cognitive function and whether these associations varied by race/ethnicity and nativity. METHOD: Using the Kaiser Healthy Aging and Diverse Life Experiences (KHANDLE) cohort (N = 1 712) with approximately equal groups of Black, White, Latino, and Asian community-dwelling older adults aged 65 years and older, we evaluated the associations between self-reported experiences of everyday and major lifetime discrimination with overall cognitive performance and domain-specific cognition (verbal episodic memory, semantic memory, and executive functioning) across race/ethnicity and nativity. Linear regression models examined the cross-sectional association between self-reported experiences of everyday and major lifetime discrimination with z-standardized coefficients for cognition. We tested for effect modification by race and nativity. All models controlled for age, sex, and education. RESULTS: Among KHANDLE participants (mean age: 76 years; SD: 6.8), everyday discrimination was not associated with cognitive scores. Major lifetime discrimination was associated with better average cognitive scores among Black participants but not among other racial/ethnic groups. Major lifetime discrimination was associated with better average cognitive scores among U.S.-born but not among non-U.S.-born individuals. CONCLUSION: Our findings do not imply that discrimination improves cognition, but rather suggest that future research should include more detailed measures on discrimination and unfair treatment that could help disentangle the extent to which relationships are causal or reflect some other underlying factor.


Healthy Aging , Aged , Cognition , Cross-Sectional Studies , Healthy Aging/psychology , Humans , Life Change Events , Perceived Discrimination
17.
J Gerontol B Psychol Sci Soc Sci ; 77(2): 261-271, 2022 02 03.
Article En | MEDLINE | ID: mdl-33842969

OBJECTIVES: Understanding racial/ethnic disparities in late-life cognitive health is a public health imperative. We used baseline data from the Kaiser Healthy Aging and Diverse Life Experiences (KHANDLE) study to examine how age, education, gender, and clinical diagnosis, a proxy for brain health, are associated with cross-sectional measures of cognition in diverse racial/ethnic groups. METHODS: Comprehensive measures of cognition were obtained using the Spanish and English Neuropsychological Assessment Scales and the National Institutes of Health Toolbox Cognitive Health Battery in a sample of 1,695 KHANDLE participants (Asians 24%, Blacks 26%, Latinos 20%, Whites 29%). A 25% random subsample was clinically evaluated and diagnosed with normal cognition, mild cognitive impairment (MCI), or dementia. Cognitive test scores were regressed on core demographic variables and diagnosis in the combined sample and in multiple group analyses stratified by racial/ethnic group. RESULTS: Race/ethnicity and education were variably associated with test scores with strongest associations with tests of vocabulary and semantic memory. Older age was associated with poorer performance on all measures, and gender differences varied across cognitive tests. Clinical diagnosis of MCI or dementia was associated with average decrements in test scores that ranged from -0.41 to -0.84 SD, with largest differences on tests of executive function and episodic memory. With few exceptions, associations of demographic variables and clinical diagnosis did not differ across racial/ethnic groups. DISCUSSION: The robust associations of cognitive test results with clinical diagnosis independent of core demographic variables and race/ethnicity support the validity of cognitive tests as indicators for brain health in diverse older adults.


Cognition , Cognitive Aging , Cognitive Dysfunction , Ethnicity , Executive Function , Aged , Cognitive Aging/physiology , Cognitive Aging/psychology , Cognitive Dysfunction/diagnosis , Cognitive Dysfunction/ethnology , Cross-Cultural Comparison , Cultural Diversity , Educational Status , Ethnicity/education , Ethnicity/psychology , Ethnicity/statistics & numerical data , Female , Healthy Aging/ethnology , Healthy Aging/psychology , Humans , Life Change Events , Male , Neuropsychological Tests/statistics & numerical data , United States/epidemiology
18.
Neurobiol Aging ; 111: 44-53, 2022 03.
Article En | MEDLINE | ID: mdl-34963063

Sites of early neuropathologic change provide important clues regarding the initial clinical features of Alzheimer's disease (AD). We have shown significant reductions in hippocampal synaptic density in participants with AD, consistent with the early degeneration of entorhinal cortical (ERC) cells that project to hippocampus via the perforant path. In this study, [11C]UCB-J binding to synaptic vesicle glycoprotein 2A (SV2A) and [18F]flortaucipir binding to tau were measured via PET in 10 participants with AD (5 mild cognitive impairment, 5 mild dementia) and 10 cognitively normal participants. In the overall sample, ERC tau was inversely associated with hippocampal synaptic density (r = -0.59, p = 0.009). After correction for partial volume effects, the association of ERC tau with hippocampal synaptic density was stronger in the overall sample (r = -0.61, p = 0.007) and in the AD group where the effect size was large, but not statistically significant (r = -0.58, p = 0.06). This inverse association of ERC tau and hippocampal synaptic density may reflect synaptic failure due to tau pathology in ERC neurons projecting to the hippocampus.


Aging/metabolism , Aging/pathology , Alzheimer Disease/metabolism , Alzheimer Disease/pathology , Cognition , Entorhinal Cortex/metabolism , Healthy Aging/metabolism , Healthy Aging/pathology , Hippocampus/pathology , Synapses/pathology , tau Proteins/metabolism , Alzheimer Disease/psychology , Entorhinal Cortex/pathology , Healthy Aging/psychology
19.
Neurobiol Aging ; 110: 1-12, 2022 02.
Article En | MEDLINE | ID: mdl-34837869

Impaired memory is a hallmark of prodromal Alzheimer's disease (AD). Prior knowledge associated with the memoranda improves memory in healthy individuals, but we ignore whether the same occurs in early AD. We used functional MRI to investigate whether prior knowledge enhances memory encoding in early AD, and whether the nature of this prior knowledge matters. Patients with early AD and Controls underwent a task-based fMRI experiment where they learned face-scene associations. Famous faces carried pre-experimental knowledge (PEK), while unknown faces with which participants were familiarized prior to learning carried experimental knowledge (EK). Surprisingly, PEK strongly enhanced subsequent memory in healthy controls, but importantly not in patients. Partly nonoverlapping brain networks supported PEK vs. EK associative encoding in healthy controls. No such networks were identified in patients. In addition, patients displayed impaired activation in a right sub hippocampal region where activity predicted successful associative memory formation for PEK stimuli. Despite the limited sample sizes of this study, these findings suggest that the role prior knowledge in new learning might have been so far overlooked and underestimated in AD patients. Prior knowledge may drive critical differences in the way healthy elderly and early AD patients learn novel associations.


Alzheimer Disease/physiopathology , Alzheimer Disease/psychology , Association Learning/physiology , Behavior/physiology , Face/physiology , Hippocampus/physiology , Hippocampus/physiopathology , Knowledge , Magnetic Resonance Imaging , Memory/physiology , Age of Onset , Aged , Alzheimer Disease/diagnostic imaging , Female , Healthy Aging/physiology , Healthy Aging/psychology , Healthy Volunteers/psychology , Humans , Male , Photic Stimulation
20.
Neurobiol Aging ; 109: 11-21, 2022 01.
Article En | MEDLINE | ID: mdl-34634749

A wide body of literature suggests that transcranial direct current stimulation (tDCS) administered over the prefrontal cortex can improve executive function - including decision-making and inhibitory control - in healthy young adults. However, the effects of tDCS in older adults are largely unknown. Here, using a double-blind, sham-controlled approach, changes in a combined perceptual decision-making and inhibitory control task were assessed before and after the application of tDCS (1 mA, 20 minute) targeting the right inferior frontal gyrus (rIFG) or pre-supplementary motor area (preSMA) in 42 young (18-34 years) and 41 older (60-80 years) healthy adults. Compared to sham stimulation, anodal tDCS over the preSMA improved decision-making speed for both age groups. Furthermore, the inhibitory control performance of older and younger adults was improved by preSMA and rIFG stimulation, respectively. This study provides evidence that tDCS can improve both perceptual decision-making and inhibitory control in healthy older adults, with the causal role of the preSMA and rIFG regions in cognitive control appearing to vary as a function of healthy ageing.


Decision Making/physiology , Executive Function/physiology , Healthy Aging/physiology , Healthy Aging/psychology , Inhibition, Psychological , Motor Cortex/physiology , Perception/physiology , Prefrontal Cortex/physiology , Transcranial Direct Current Stimulation , Adult , Aged , Aged, 80 and over , Cognition , Double-Blind Method , Humans , Male , Young Adult
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