The effect of acculturation on cognitive performance among older Hispanics in the United States

Normative data for executive function tests in an Ecuadorian Waranka minority population

Objective: To generate normative data (ND) for executive functions tests in the Waranka minority population of Ecuador. Method: Four-hundred participants aged 6-17 completed the Symbol-Digit Modalities Test (SDMT), Trail-Making Test (TMT), Modified-Wisconsin Card Sorting Test (M-WCST), and Test of Colors-Words (STROOP). Scores were normed using multiple linear regressions, including age, age2, natural logarithm of mean parent education (MPE), sex, bilingualism, and two-way interactions as predictors. Results: Age by MPE and Age2 by MPE interactions arose for SDMT, so that children with illiterate parents scored lower than those with literate parents. Girls scored higher in SDMT. All TMT and M-WCST scores were influenced by age2. Age by MPE interaction was found for TMT-A, so that children with higher MPE went faster; and age by bilingualism interaction for TMT-B, so that more bilingual children needed less time. Stroop-Word and Color were influenced by age2 by MPE interaction, so that children, while older, scored higher, especially those with higher MPE. Also, age2 by sex interaction arose, so that girls increased scores curvilinearly while boys linearly. Word-Color was influenced by age, while Stroop-interference by age2. Age by MPE interaction was found for MCST-Categories and Perseveration, so that perseverations decreased to then increased, especially in those with illiterate parents. M-WCST-Category scores increased to then decrease later on age in children with illiterate parents. Z-scores calculated through indigenous ND were significantly lower than generated through non-indigenous norms. Conclusions: ND for minority populations are critical since Waranka sample performed worse when using non-indigenous norms for z-score calculation.

The Role of Ethnic Community Social Capital in the Association between Acculturation and Psychological Distress among Older Korean Americans

Guided by the theories of social capital and stress-buffering, we examined how the association between low acculturation and poor mental health among older immigrants would be modified by social capital in ethnic communities (social cohesion, social engagement, perceived ethnic density, and the quality of social interaction). Using data from the Study of Older Korean Americans (N = 2,150, Mean age = 73.4), direct and interactive effect models were examined. Lower acculturation was associated with a greater level of psychological distress, and their link was modified by social cohesion (β = .19, p < .01) and negative social interactions (β =  - .97, p < .01). Findings suggest that the mental health risk associated with low acculturation could be intensified when older immigrants perceive low sense of cohesion in their ethnic communities or have negative interactions with ethnic community members.

The Measurement of Acculturation in Neuropsychological Evaluations of Hispanic/Latino Individuals across the Lifespan: A Scoping Review of the Literature

OBJECTIVE

Acculturation has been linked to health outcomes in Hispanics/Latinos (H/Ls). However, there is equivocal evidence of a relationship between acculturation and neuropsychological outcomes. Various factors limit the ability to subject the evidence to systematic/meta-analytic review. We sought to examine the current state of the literature in the context of H/Ls and neuropsychology and describe the various limitations of measuring acculturation across the lifespan.

METHOD

Applying a scoping review approach, we identified unique stand-alone (e.g., questionnaires) measures of acculturation. We focused on psychometric (e.g., internal consistency) and other characteristics (e.g., language, structure/format) and description of the validation samples (e.g., cultural background/country of origin).

RESULTS

A total of 40 unique acculturation measures were identified. Measures spanned various domains (e.g., language proficiency, food preference, music choice), and relied heavily on linguistic behavioral characteristics. Internal consistency varied from unacceptable to clinically acceptable ranges. Variable approaches to development and validation were reported. Validation samples varied from 22 to 2,048 respondents (median = 380), most of which represented a general adult population. Only eight measures were validated for use in pediatric populations; none were developed specifically for use with older adults.

CONCLUSIONS

Published measures are outdated, evidence highly variable psychometric and methodological weaknesses, and lack a lifespan perspective. Several themes in the types of items considered elemental to the acculturative process are revealed and findings are summarized via an "ABC" framework, categorizing items as antecedents, behaviors, and consequent acculturative changes, that lends itself to clinical and research settings.

A Longitudinal Study of Acculturation in Context and Cardiovascular Health and Their Effects on Cognition Among Older Latino Adults

Background We previously outlined the importance of considering acculturation within the context of older Latino adults' lived experience (ie, acculturation in context) to better capture contributors to cognitive aging. We now examine this conceptual framework as related to level of and change in cardiovascular health, and whether cardiovascular health modifies previously documented associations of acculturation in context with cognition. Methods and Results Acculturation in context data from 192 Latino participants without dementia at baseline (age ~70 years) were compiled into 3 separate composite scores: acculturation-related (nativity, language-, and social-based preferences), contextually related socioenvironmental (experiences of discrimination, social isolation, social networks), and familism-related (Latino-centric family ethos). A modified American Heart Association's Life's Simple 7 (mLS7; ie, smoking, physical activity, body mass index, blood pressure, total cholesterol, blood glucose) was used to measure cardiovascular health. Mixed effects regressions simultaneously tested the association of all 3 composite scores with total mLS7 adjusting for confounders. Separate models tested whether mLS7 modified associations of the 3 composite scores and cognition. The contextually related socioenvironmental composite score reflecting higher discrimination, higher social isolation, and smaller social networks (estimate=0.22, SE=0.10, P=0.02) and the familism score (estimate=0.16, SE=0.07, P=0.02) both significantly associated with change in total mLS7. The acculturation-related composite was not significantly associated with change in mLS7. No composite was significantly associated with level of mLS7. Total mLS7, however, significantly modified associations between the acculturation-related composite and change in working memory (estimate=-0.02, SE=0.01, P=0.043). Conclusions Acculturation within the context of older Latino adults' lived experience is important for maintaining cardiovascular health, relationships that also affect domain-specific cognitive decline.

Associations Between Parity and Cognition: Race/Ethnic Differences

BACKGROUND

Race/ethnicity is associated with differences in reproductive history and cognition individually, yet it remains an understudied factor in the relationship between parity and later-life cognition.

OBJECTIVE

To evaluate if the association between parity and cognition differs between racial/ethnic groups.

METHODS

Participants included 778 older, postmenopausal women from the Health and Nutrition Examination Survey (Latina: n = 178, Non-Latino Black [NLB]: n = 169, Non-Latino White [NLW]: n = 431) who self-reported at least one birth. Cognitive outcomes included working memory, learning memory, and verbal fluency. Covariates included age, education, cardiovascular and other reproductive health factors, adult socioeconomic status (SES) and depressive symptoms. We fit a series of linear models to examine a) whether parity was associated with cognitive functioning, b) if this association varied by race/ethnicity through parity by race/ethnicity interactions, and c) individual parity with cognition associations stratified by race/ethnicity.

RESULTS

In the full sample, parity was significantly negatively associated with Digit Symbol Substitution Test (DSST) performance (b = -0.70, p = 0.024) but not Animal Fluency or word-list learning and memory. Tests of race/ethnicity-by-parity interactions were not statistically significant (ps > 0.05). However, stratified analyses by race/ethnicity showed a differential effect of parity on DSST performance, such that parity was significantly negatively associated with DSST performance (b = -1.66, p = 0.007) among Latinas but not in NLWs (b = -0.16, p = 0.74) or NLBs (b = -0.81, p = 0.191).

CONCLUSION

Among Latina, but not NLB or NLW women, greater parity was associated with worse processing speed/executive functioning later in life. Further research is needed to understand the mechanisms driving racial/ethnic differences.

Wisconsin Card Sorting Task-64 performance among HIV+ Black/African American and Latinx adults compared to normative samples and by sociocultural and health variables

Many people living with HIV experience cognitive impairment, and HIV disproportionately affects racial/ethnic minority groups. Independent of HIV, racial/ethnic minority individuals perform worse than White individuals on cognitive tasks, even after accounting for education. Our goals were to (1) compare WCST-64 scores between HIV+ Black/African American (Black/AA) (n = 45) and Latinx (n = 41) urban-dwelling adults; (2) compare our total sample to the WCST-64 manual's normative (N) and clinical normative (CN) groups; and (3) explore relationships between WCST-64 performance and sociocultural/health variables. In our sample, employment (12%), mean annual income (<$10,000), and mean education (<12 years) were low, while mean medication adherence rates were high for both Black/AA (90%) and Latinx (87%). WCST-64 scores were similar between groups (p > .05). Percentages of "below average" and "mildly impaired" scores in our sample were higher than the N group, and similar to the CN group. Lifetime heroin use, dementia, and longer HIV illness duration were significantly associated with worse WCST-64 performance (ps < .05). The observed low scores in our asymptomatic sample are likely due to the intersectionality of sociocultural and medical burden, highlighting complexities in interpreting neuropsychological data in real-world HIV+ clinics. Executive deficits are linked to poorer outcomes, and routine cognitive screening may be clinically indicated.

Cognitive reserve, cognition, and real-world functioning in MCI: A systematic review and meta-analysis

OBJECTIVE

To synthesize quantitatively the mild cognitive impairment (MCI) literature with respect to the relationship between cognitive reserve and neuropsychological and functional outcomes.

METHOD

Participants with a diagnosis of MCI (total n = 7,871; 53% female) were included in this random-effects meta-analysis. Neuropsychological measures were combined into composite scores (e.g., overall cognitive functioning, screening measures, memory, language, visuospatial, attention/processing speed/working memory, executive functioning, and motor functioning). Measures assessing real-world abilities were combined into an activities of daily living (ADL) composite.

RESULTS

Nearly all neuropsychological composite values were significantly correlated with education, with effect sizes ranging from small to moderate. The effect between overall neuropsychological functioning and occupation was weak and varied by cognitive domain. For cognitively stimulating leisure activity, only overall neuropsychological functioning demonstrated a significant relationship, with a weak effect size (r = .16). In contrast, ADLs were most strongly associated with leisure experience (r = .27), with a negligible relationship with education (r = 0.08) and occupation (r = 0.09).

CONCLUSIONS

Of the cognitive reserve proxies examined in this study, participation in leisure activity had the largest magnitude of effect size with ADL functioning. This was in stark contrast to the negligible relationship found for education and occupation. Although education has been widely considered the most important cognitive reserve proxy with respect to cognition, this work questions whether other lifestyle factors may play a more important role in preserving real world functioning.

Culture, Ethnicity, and Level of Education in Alzheimer's Disease

Alzheimer's disease (AD) is the most frequent cause of dementia, where the abnormal accumulation of beta-amyloid (Aβ) and tau lead to neurodegeneration as well as loss of cognitive, behavioral, and functional abilities. The present review analyzes AD from a cross-cultural neuropsychological perspective, looking at differences in culture-associated variables, neuropsychological test performance and biomarkers across ethnic and racial groups. Studies have found significant effects of culture, preferred language, country of origin, race, and ethnicity on cognitive test performance, although the definition of those grouping terms varies across studies. Together, with the substantial underrepresentation of minority groups in research, the inconsistent classification might conduce to an inaccuratte diagnosis that often results from biases in testing procedures that favor the group to which test developers belong. These biases persist even after adjusting for variables related to disadvantageous societal conditions, such as low level of education, unfavorable socioeconomic status, health care access, or psychological stressors. All too frequently, educational level is confounded with culture. Minorities often have lower educational attainment and lower quality of education, causing differences in test results that are then attributed to culture. Higher levels of education are also associated with increased cognitive reserve, a protective factor against cognitive decline in the presence of neurodegeneration. Biomarker research suggests there might be significant differences in specific biomarker profiles for each ethnicity/race in need of accurate cultural definitions to adequately predict risk and disease progression across ethnic/racial groups. Overall, this review highlights the need for diversity in all domains of AD research that lack inclusion and the collection of relevant information from these groups.