Rethinking Social Relationships in Adulthood: The Differential Investment of Resources Model

Intimate partner relationship breakdown and suicidal ideation in a large representative cohort of Australian men

This study examined moderators of the association between intimate relationship breakdown and suicidal ideation using data from a large representative cohort of Australian men. Across four waves (2013-2022), participants (n = 14,610) responded to measures of past 12-month relationship breakdown, past 2-week suicidal ideation, theorised but to-date untested moderators (age, social support, alcohol use, and masculine norms of self-reliance and emotional control), and demographic covariates. Binomial logistic regression models using generalised estimating equations modelled the association between relationship breakdown and suicidal ideation at both proximal (i.e., within-wave), and future (i.e., at the next wave) timepoints, with iterative adjustments for wave, demographics, other covariates, and prior-wave suicidal ideation. Interaction terms in sequential models examined moderation. In multi-wave cross-sectional analyses, after full adjustment, relationship breakdown was associated with 82 % greater odds of suicidal ideation (OR = 1.82, 95 % CI 1.56-2.12). Moderation analyses indicated that this association was specific to men without prior-wave suicidal ideation (OR = 2.18, 95 % CI 1.85-2.56), in comparison to men who had reported prior-wave suicidal ideation (OR = 1.19, 95 % CI 0.94-1.51). The association between relationship breakdown and proximal ideation did not differ by men's age, levels of social support, harmful alcohol use, or endorsement of self-reliance or emotional control. Finally, longitudinal models highlighted relationship breakdown was not associated with men's suicidal ideation at a subsequent wave, after adjustment for covariates and proximal suicidal ideation. Our findings suggest that suicidal ideation should be monitored in men known to have experienced relationship breakdown in the past year, especially those without a recent history of suicidal ideation.

Resilience Through Social Connectedness and Cognition: Is Theory of Mind a Form of Enrichment for Older adults?

OBJECTIVE

Social connectedness is a modifiable lifestyle factor that delays age-related cognitive decline. Using cross-sectional, longitudinal, and experimental approaches, we examined whether theory of mind-inferring what others think or feel-is a potential mechanism underlying this relationship.

METHODS

In Study 1, 305 community-dwelling older adults participating in two different, but related, studies completed comprehensive measures of general cognition, theory of mind, and personal social networks. We examined whether theory of mind mediated the relationship between older adults' social connectedness and cognition. One hundred and ten of those participants completed follow-up social network interviews and cognitive assessments about 1.5 years later to determine whether baseline social connectedness and theory of mind predicted cognitive change. In Study 2, 55 other older adults completed a procedural discourse task targeting a close and distant network member. We predicted that higher theory of mind would be reflected through providing more details to distant, versus close, others, especially among older adults with larger, less interconnected, personal social networks.

RESULTS

Results revealed that theory of mind accounted for 32% of the relationship between social connectedness and overall cognition, even when covarying age, gender, education, and a control task. The effects were particularly robust for episodic memory and language. Longitudinal analyses replicated this pattern. In Study 2, older adults with larger, less dense social networks provided more details to distant versus very close network members.

DISCUSSION

Together, these results suggest that theory of mind may provide the mechanism through which social connectedness confers cognitive resilience associated with slower cognitive decline.

Impact of a 10-Week Aqua Fitness Intervention on Physical Fitness and Psychosocial Measures in Inactive Healthy Adult Women

Background/objectives: Previous studies on aquatic exercises have primarily focused on either physical fitness or psychological outcomes. This study examines the effects of a structured 10-week aqua fitness program on physical fitness and psychosocial outcomes in healthy adult women. Additionally, a 4-week training cessation period was incorporated to assess the sustainability of any observed physical fitness benefits. Methods: A total of 32 female participants (mean age 51.28 ± 9.12 years) with prior aqua aerobics experience engaged in supervised aqua fitness sessions, conducted three times per week (~55 min/session) at moderate intensity (RPE = 12, on a 6-20 scale). The physical fitness outcomes assessed included dominant hand grip strength, lower limb muscle endurance, dynamic balance, mobility, and upper and lower limb flexibility. The psychosocial outcomes included subjective well-being and social inclusion. Results: The results demonstrate significant improvements in dynamic balance (ES = 0.85) and lower limb flexibility (ES = 0.73 and 0.65 for the two limbs, respectively), with smaller yet notable gains observed in other physical fitness outcomes (ES = from 0.20 to 0.48). On the contrary, only a marginal improvement was detected in a single domain of subjective well-being (environmental domain, ES = 0.35) and no changes were observed across the seven domains of social inclusion. Importantly, all physical fitness gains were maintained during the 4-week training cessation period, with lower limb flexibility showing additional improvements. Conclusions: These findings underscore the effectiveness of supervised aqua fitness programs in enhancing physical fitness in middle-aged women, while their impact on psychosocial outcomes appears limited in this population.

Playing Kioku Reduces Loneliness in Older Adults: A Pilot Study

Introduction: Playing together increases social connectedness, and it may be a tool to reduce loneliness. Research into the mental health benefits of board games is underdeveloped. Objectives: The study aims to examine the effects of the Kioku board game on well-being outcomes. The Kioku board game was developed in order to enable small group interactions with a focus on encouraging participants to create stories through mutual attention and interaction. We hypothesized that following a weekly intervention for 12 weeks, players would report a decrease in loneliness and an increase in well-being, compared with nonplayers. Methods: During the summer of 2022, participants in groups of 4-5 players, chose a cube word and narrated a story. A sample of 151 older adults (Mean age = 75.05 ± 6.46 years) recruited from seven community activity centers in Israel was assigned by block randomization to an intervention (n = 72) or a control group (n = 79), awaiting 4-6 weeks for future participation. Loneliness (UCLA loneliness scale) and well-being (World Health Organization 5-item scale) were evaluated at baseline and at 12 weeks. Results: A two-way repeated measures analysis of covariance (ANCOVA) (Group × Time) controlling for age, country of origin, and marital status revealed significant interaction effects for loneliness [F(1, 146) = 178.04, n2 = 0.549, P < 0.001] and well-being [F(1, 146) = 69.14, n2 = 0.321, P < 0.001]. Loneliness decreased in the intervention group (mean difference: 0.62 points, P < 0.001), and increased in the control group (mean difference: 0.18 points, P = 0.001). Well-being increased in the intervention group (mean difference: 0.79 points, P < 0.001) and decreased in the control group (mean difference: 0.20 points, P < 0.001). Conclusions: Our findings support the effectiveness of the Kioku board game intervention for decreasing loneliness and promoting well-being in older adults, who might still be coping with the effects of the COVID-19 pandemic.

Context Matters: Internet Usage and Loneliness Among Middle-Aged and Older Adults During the COVID-19 Pandemic

OBJECTIVES

Later life is often categorized by higher-than-average levels of loneliness, but individual differences are vast and not well understood. Emerging evidence indicates that broad-based contextual factors such as the coronavirus disease 2019 (COVID-19) pandemic-and the use of the internet throughout-are differentially associated with the experience of loneliness. We, therefore, target internet usage and loneliness among middle-aged and older adults during the pandemic and examine the moderating role of age, gender, and limiting illness therein.

METHODS

We applied hierarchical regression models to data from the COVID-19 substudy Wave 1 (June/July 2020) of the English Longitudinal Study of Ageing (N = 4,790; Mage = 70.2; standard deviation = 9.0; range: 50-90; 43.5% male).

RESULTS

Infrequent internet use was associated with less loneliness compared with very frequent users-an association that strengthened with age. Conversely, the purpose of internet use was associated with more loneliness, with higher levels exhibited by those searching for health-related information-an effect stronger among those with a limiting illness.

DISCUSSION

Findings imply that infrequent internet use may reduce loneliness, while health-related internet searches may increase loneliness among older adults with different physical capacities. Findings are contrary to prepandemic reports, underscoring the importance of broad-based contextual factors for understanding loneliness across adulthood and old age.

Loneliness and Expanding Social Ties in Later Life: Motivation, Perceived Success, and Implications for Emotional Health

OBJECTIVES

Social networks undergo changes in later life, reflecting proactive decreases as well as increases in size, but relatively little is known about the factors that motivate older adults to expand their social ties. Loneliness might be expected to motivate older adults to expand their social ties. Paradoxically, however, studies of younger age groups have linked loneliness to a self-protective reluctance to initiate social contact. The current study investigated whether loneliness fosters or inhibits older adults' efforts to expand their social ties and whether successful efforts are related to gains in emotional health.

METHODS

Loneliness, motivation to expand social ties, and emotional health were assessed in a subset of older participants (N = 375) from the Later Life Study of Social Exchanges.

RESULTS

Greater loneliness was associated with less interest, less investment of effort, and less success in making new ties and rekindling dormant ties. Nonetheless, lonelier older adults who expanded their social ties, particularly by rekindling dormant ties, exhibited some gains in emotional health over a 1-year period.

DISCUSSION

Greater attention to the role of loneliness in older adults' motivations for making new ties or rekindling dormant ties will broaden our understanding of social network changes in later life.

A Randomized Controlled Trial of a Behavioral Activation Intervention to Increase Engagement with Life and Well-Being in Older Adults

INTRODUCTION

Engagement with life is central to aging well. There is currently a lack of flexible programs for promoting engagement that tailor to the unique interests, capacities, and life circumstances of individuals. We designed and evaluated a new program for promoting engagement with later life based on principles of behavioral activation.

METHODS

A total of 135 adults aged 65 years and older who scored at or below the median on the Life Engagement Test were randomly assigned to either a 6-week behavioral activation program (n = 69) or a 6-week well-being program based on brief positive psychology interventions (the active control; n = 66). Participants completed assessments at baseline, 1-week follow-up, and 3-month follow-up. The primary outcome was engagement with life, and secondary outcome measures included social network characteristics, measures of mental health, well-being, and psychological and self-regulatory resources.

RESULTS

Participants in both conditions showed improvements in engagement with life post-intervention that were sustained at 3 months. Post-intervention improvements in both conditions were observed across most secondary outcomes; however, for several outcomes, participants with more limited functional and cognitive resources benefitted from participation in the positive psychology (active control) condition, but not the treatment condition.

CONCLUSION

Similar levels of improvement in engagement with life and well-being were evident for participants who completed a behavioral activation-focused intervention, compared with participants who completed a positive psychology-focused intervention. The positive psychology approach may confer greater benefits for emotional well-being among those with poorer functional and cognitive abilities.

The role of social network diversity in self-perceptions of aging in later life

While the link between self-perceptions of aging (SPA) and healthy aging is well established, less is known about the association between social factors and SPA. The present study investigated whether higher social network diversity is associated with more positive and less negative SPA and whether this association is moderated by age. We examined cross-sectional data from the German Ageing Survey of 2008 (DEAS; N = 6205, 40-85 years, 49.5% female). Network diversity was assessed as the number of social roles in an individual's network (such as spouse, friend and colleague). Three domains of SPA were measured using the Aging-Related Cognitions Scale (AgeCog): ongoing development (positive SPA), social losses (negative SPA) and physical losses (negative SPA). We conducted multiple linear regression models and tested for a moderator effect of age using an interaction term of age and network diversity. Results showed that at higher ages older adults with higher network diversity reported more positive SPA related to ongoing development and more negative SPA related to social losses than those with less diverse networks, indicating that age has a moderating effect. We found no association between network diversity and negative SPA related to physical losses and no indication that age was relevant to this relationship. The present study adds to evidence on the role of social networks in SPA. Our findings suggest that in certain SPA domains and depending on age, network diversity is related to both more positive and more negative SPA, which emphasizes the importance of considering domain-specific SPA.

Engage! a pilot study of a brief behavioural activation program to promote engagement and well-being in older adults

Previous research has indicated the suitability of behavioural activation (BA) as an intervention for reducing depression in older adults. However, little research has investigated the potential of BA to increase active engagement and well-being in older adults. The current pilot study sought to investigate the usefulness and acceptability of BA to promote well-being in a group of non-clinical older adults. Participants (N = 18) aged between 65 and 86 (M = 77.82, SD = 5.59) who were retired and living independently in the community were provided a 6-week BA program predominantly delivered online. Treatment retention, self-ratings, and participants' compliance to treatment principles indicate preliminary feasibility for the use of BA as an approach for increasing active engagement in older adult populations. Participants also provided feedback on their experiences with the program post-intervention via individual structured interviews. Thematic analysis of these data revealed that participants found the program to be beneficial in terms of increased self-awareness and social engagement, and provided several recommendations for improving acceptability of the program and workbook. The unexpected events relating to the first wave of the novel coronavirus (COVID-19) led to necessary adaptations to delivery modalities, and provided the researchers with an opportunity to investigate the use of a structured well-being program on a high-risk population during a pandemic. Our findings support the proposition that BA is a suitable intervention for increasing engagement and well-being in older adults, provide insight into adapting programs for older adults, and suggest next steps for testing intervention efficacy.

Understanding loneliness in late life

Loneliness in late adulthood is a public health issue. Thus, understanding the etiology of loneliness is of critical importance. Here, we conceptualize the development of loneliness in late life as dynamic interactions between individual and contextual processes. Specifically, we suggest that loneliness arises if the existing social relationships are unable to meet a set of social expectations. These expectations are fulfilled by three different layers of the social structure: 1) close confidants; 2) broader social networks; and 3) involvement in the community. Although older adults experience losses in their broader network and engage less in the community, they may avoid loneliness by focusing on close confidants. However, these adaptations may make it more difficult for older adults to overcome loneliness.

Predictive factors and risk and protection groups for loneliness in older adults: a population-based study

BACKGROUND

Loneliness is considered a public health problem, particularly among older adults. Although risk factors for loneliness have been studied extensively, fewer studies have focused on the protected and risk groups that these factors configure. Our objective is to analyze the variables and latent factors that predict loneliness in older adults and that enable risk and protected groups to be configured.

METHODS

We employed an epidemiological, cross-sectional survey that was carried out on a random sample of 2060 people over 65 years extracted from the census. A structured telephone interview was used to assess mental and physical health, habits, quality of life, and loneliness, applying the COOP-Wonca, Goldberg General Health (GHQ-12), and Barber Questionnaires.

RESULTS

Predictors of loneliness were: mental health, living alone, quality of life, depressive symptoms, low educational level, and some deficiency situations such as having no one to turn to for help. The factors extracted (Factorial Analysis) were: a subjective experience of poor health, objective isolation, and psychological isolation. We established at risk and protected groups ("Decision Tree" procedure), and loneliness was referred to by 73.2% of the people living alone and with poor mental health and quality of life (risk group). By contrast, only 0.8% of people living with others, with good mental health and good quality of life felt loneliness (protected group).

CONCLUSION

In a well-developed city, subjective and objective factors are associated with loneliness. These factors, especially those associated with at risk or protected groups, must be considered to develop strategies that address loneliness.

Men's Social Connectedness in Later Life: A Qualitative Study with Older Men

This qualitative study aimed to understand men's social connectedness in later life in Portugal focusing on their perceptions, obstacles, strategies, and impact on well-being. The sample included 104 older Portuguese men over 65 years of age (Mage = 70.76 years). The qualitative data were the direct transcriptions of the answers given by participants to the electronic interview using thematic analysis. Findings revealed six overarching themes encompassing 18 subcategories: definitions of social connectedness (social support, community identity, mental health promotion, use of community structures), difficulties/obstacles in maintaining social connectedness (ageism, lack of initiative, physical limitations, psychological traits, resources), strategies/actions or resources to establish social connections (use of technology, use of community groups, leisure and sport activities, church/religion), negative impact of difficulties in establishing relevant social connections (mental health, physical health, relationships), positive actions from being socially connected (positive prescriptions to promote social connectedness), and concerns from being socially disconnected (health risks). These findings indicate that the lack of social connectedness creates social vulnerability in later life, and social support is needed to ensure safer aging among older men.

Friendship trajectories and health across the lifespan

Friends are a vital source of social relations throughout the lifespan and across developmental stages. Our knowledge of how friendships develop over time, especially from childhood through adulthood, is limited. Furthermore, it is now recognized that this specific type of relationship influences health across the life course in unique ways. Using the Convoy Model of Social Relations as a guiding framework, this study charts the multiple and unique trajectories of friendship across adulthood and tests whether these trajectories influence health differentially by age. The sample for the study consisted of 553 adults from the longitudinal Social Relations Study. Respondents ranged in age from 13 to 77 at Wave 1 (1992), and included only those who reported a best friend in each wave, that is, Wave 2 (2005) and Wave 3 (2015). Approximately 65% of the respondents were women, and 24.5% were people of color. Latent growth curve analysis identified three trajectories of the presence of friends in one's network over time, two trajectories of positive friend quality, and three for negative quality. The most consistent findings are associated with positive friend relations over time. Gender was associated with friendship quality where women reported more positive friend relations over time, and increasing positive friend relations predicted better health 23 years later. These findings demonstrate that consistent and increasing positive friendships yield health benefits over time, whereas the presence of friends and negative quality does not have an effect. Overall, findings advance understanding of the long-term effects of social relations across the lifespan and life course. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

A systematic review of reviews on the psychometric properties of measures of older persons' ability to build and maintain social relationships

BACKGROUND

Within the scope of the World Health Organisation's (WHO) world report on ageing and health and how healthy ageing was conceptualised, the WHO has been working with academia towards producing reviews of the psychometric properties of instruments that measure different domains of functional ability. This study aimed to conduct a review of reviews to examine existing and validated instruments measuring the ability of older persons to build and maintain social relationships and to evaluate the psychometric properties of these instruments.

METHODS

We searched for studies published in the English, Spanish and Portuguese languages. No restrictions were placed on the year of publication. The following databases were searched: PubMed, Embase, Psyinfo and Cumulated Index to Nursing and Allied Health Literature. Titles and abstracts were screened and selected articles were screened and reviewed independently by two reviewers.

RESULTS

A total of 3,879 records were retrieved, of which 39 records were retrieved for full-text analysis. None of the reviews met the inclusion criteria, thus resulting in an empty review.

CONCLUSIONS

Considering the current definition of older persons' functional ability to build and maintain social relationships, this review did not identify instruments that can measure both constructs simultaneously. We suggest the development of an instrument that simultaneously assesses the ability of older persons to build and maintain relationships.

The Risks of Experiencing Severe Loneliness Across Middle and Late Adulthood

OBJECTIVES

From a theoretical point of view, older adults may not necessarily face a greater risk of becoming lonely than middle-aged adults but are more likely at a disadvantage in fighting loneliness. Therefore, in this study, we differentiate between the risk of becoming lonely and the risk of remaining lonely.

METHODS

A large longitudinal data set representative of the German noninstitutionalized population from 40 to 85 years of age (N = 15,408; 49% female participants) was used in the analysis. Lagged logistic regression models were estimated to investigate the effect of earlier experiences of severe loneliness on the risk of being lonely after three years across middle age and late adulthood. Individual differences in health, views on aging, and social activities were taken into account to explore their role in age differences in the risk of remaining lonely.

RESULTS

The analysis revealed marginal age differences in the risk of becoming lonely but a marked age gradient regarding the risk of remaining lonely. Lonely older adults who were older than 75 years of age were more likely to remain lonely after three years than lonely middle-aged adults. Controlling for individual differences in health, views on aging as social loss, and social activities accounted for this age difference.

DISCUSSION

Interventions against loneliness may prioritize older age groups because losses in capacities, shifts in motivations, and a degraded opportunity structure render it increasingly less likely that older adults leave a state of loneliness on their own accord.

Friendships and Emotional Well-Being in the Context of Race and Age

BACKGROUND AND OBJECTIVES

Research suggests that friendships are associated with better emotional outcomes. Still, little is known about the implications of daily friend encounters on emotional well-being in the context of race and age. Guided by the integrative conceptual framework for friendship research, this study considers racism and cultural beliefs associated with racial groups and different social and emotional goals associated with age and investigates whether the frequency of friend encounters and the link between friend encounters and emotional well-being in everyday life would vary by race and age.

RESEARCH DESIGN AND METHODS

Black (n = 80; Mage = 53.62) and White American adults (n = 89, Mage = 52.01) from the Stress and Well-being in Everyday Life study provided background and social network information, followed by ecological momentary assessment surveys in which they reported their social encounters and mood every 3 hours for 4 consecutive days.

RESULTS

Multilevel linear models revealed no significant differences by race or age in the frequency of friend encounters. At times when individuals were with friends, their positive mood was elevated compared to when they were not (within-person association). Yet, this association was observed only among White adults and among Black individuals who were aged 41 or younger.

DISCUSSION AND IMPLICATIONS

This work contributes to the conceptual framework for friendship research by considering how individuals' race and age are linked to friendship patterns. Findings highlight the importance of everyday contact with friends for enhancing momentary emotional well-being, particularly among White individuals and younger Black adults.

Understanding and Addressing Older Adults' Loneliness: The Social Relationship Expectations Framework

Loneliness is an experience resulting from a perceived discrepancy between expected and actual social relationships. Although this discrepancy is widely considered the "core mechanism" of loneliness, previous research and interventions have not sufficiently addressed what older adults specifically expect from their social relationships. To address this gap and to help situate research on older adults' loneliness within broader life span developmental theories, we propose a theoretical framework that outlines six key social relationship expectations of older adults based on research from psychology, gerontology, and anthropology: availability of social contacts, receiving care and support, intimacy and understanding, enjoyment and shared interests, generativity and contribution, and being respected and valued. We further argue that a complete understanding of loneliness across the life span requires attention to the powerful impacts of contextual factors (e.g., culture, functional limitations, social network changes) on the expression and fulfillment of older adults' universal and age-specific relationship expectations. The proposed Social Relationship Expectations Framework may fruitfully inform future loneliness research and interventions for a heterogeneous aging population.

Relocation Later in Life and Contact Frequency With Friends: Do Contact Modes Matter?

We examined changes in the frequencies of in-person, telephone, and written or email contact with friends in older adults who move short or longer distances. 3820 adults aged 50 years or older were included from a nationally representative sample from the Health and Retirement Study. Using ordinal logistic regression, we found differential effects of geographical distances on the in-person, telephone, and write or email contact with friends. Specifically, in-person contact frequency was most sensitive to distance. Telephone contact frequency was only impacted by long-distance moves; however, email contact frequency was not influenced by distance. Findings suggest that the impact of relocation on contact frequency exists even though communication technology gives older adults flexibility in maintaining frequent contact with their friends. We discuss our findings through the lens of socioemotional selective theory and social convoy model. Future studies could examine factors linked to changes in the amount and modes of contact.

Alternating time spent on social interactions and solitude in healthy older adults

Time spent on being with others (social interactions) and being alone (solitude) in day to day life might reflect older adults' agentic regulatory strategies to balance the needs to belong and to conserve energy. Motivated from a joint lifespan psychological and social relationship theoretical perspective, this study examined how time spent on social interactions and solitude alternatively unfolds within individuals in daily life, relating to individual differences in trait-level well-being and fatigue. Over 21 days, a total of 11,172 valid records of social interactions were collected from 118 older adults (aged 65-94 years) in a smartphone-based event-contingent ambulatory assessment study in Switzerland. On average, a social interaction episode lasted 39 min and a solitude episode lasted 5.03 hr. Multilevel models showed that, at the within-person level, a longer-than-usual social interaction preceded and was followed by a longer-than-usual solitude episode. Moderator analyses showed that older adults with higher trait life satisfaction and lower trait fatigue spent even more time in social interactions after longer solitude episodes, amplifying the solitude-then-interaction association. Our findings suggest that whereas social interaction is a means to improve well-being, solitude is also an integral part in older adults' daily life supporting energy recovery.

Awareness of age-related gains and losses as moderators of daily stress reactivity in middle- and older-adulthood

Objectives

Associations between awareness of one's own aging and wellbeing have received increasing attention in the field of gerontology over the last decade. The current study examines how between-person differences and within-person fluctuations of awareness of age-related change (AARC) relate to daily negative affect and vitality. Of key interest was the extent to which fluctuations in AARC moderated reactivity to stressor exposure. We predicted that higher positive perceptions of aging (AARC-gains) would buffer the relationship between daily stressors and negative affect/vitality. Conversely, we expected that higher negative perceptions (AARC-losses) may exacerbate the relationship between daily stressors and the outcome variables.

Methods

Data were collected from a community-based sample of 152 Australian adults aged 53-86 (M = 69.18, SD = 5.73). For 10 consecutive days, participants completed surveys on their smartphones measuring daily stressors, AARC, and affect (positive and negative). Bayesian hierarchical linear models were used to examine whether AARC-gains and AARC-losses moderated within-person associations of daily stressors and affect (i.e., stress reactivity).

Results

At the between-person level, higher AARC-gains was associated with lower negative affect and higher vitality, whereas those reporting higher AARC-losses scored higher on negative affect and lower on vitality. Within-person variables revealed that on days when AARC-gains was higher and AARC-losses was lower, this corresponded with lower negative affect and higher vitality. There was no evidence in support of individual moderating effects of within-person AARC-losses or within-person AARC-gains on stress reactivity. A trend was evident in support of a three-way WP Stress severity × WP AARC-gains × WP AARC-losses interaction in the prediction of negative affect, indicating that on days when AARC-losses was higher, the association of stress severity with negative affect was weaker if AARC-gains was higher. Follow-up analyses modeling quadratic stress severity revealed a trend suggesting an interaction of within-person stress severity and within-person AARC-losses.

Discussion

Results indicate that both individual differences and short-term fluctuations in AARC are associated with daily negative affect and vitality. The results provided qualified support for a possible protective role of AARC-gains in the context of stress reactivity.

Age-related differences in ventral striatal and default mode network function during reciprocated trust

Social relationships change across the lifespan as social networks narrow and motivational priorities shift to the present. Interestingly, aging is also associated with changes in executive function, including decision-making abilities, but it remains unclear how age-related changes in both domains interact to impact financial decisions involving other people. To study this problem, we recruited 50 human participants (Nyounger = 26, ages 18-34; Nolder = 24, ages 63-80) to play an economic trust game as the investor with three partners (friend, stranger, and computer) who played the role of investee. Investors underwent functional magnetic resonance imaging (fMRI) during the trust game while investees were seated outside of the scanner. Building on our previous work with younger adults showing both enhanced striatal responses and altered default-mode network (DMN) connectivity as a function of social closeness during reciprocated trust, we predicted that these relations would exhibit age-related differences. We found that striatal responses to reciprocated trust from friends relative to strangers and computers were blunted in older adults relative to younger adults, thus supporting our primary pre-registered hypothesis regarding social closeness. We also found that older adults exhibited enhanced DMN connectivity with the temporoparietal junction (TPJ) during reciprocated trust from friends compared to computers while younger adults exhibited the opposite pattern. Taken together, these results advance our understanding of age-related differences in sensitivity to social closeness in the context of trusting others.

Implementation intentions to express gratitude increase daily time co-present with an intimate partner, and moderate effects of variation in CD38

Close social connections drive mental and physical health and promote longevity. Positive, other-focused behavior like expressing gratitude may be a key mechanism for increasing close bonds. Existing evidence consistent with this claim is predominantly correlational, likely driven by challenges in causally influencing and sustaining behavior change in the context of ongoing relationships. This 5-week field experiment with daily data from couples provides the first evidence for a brief, low-cost behavioral technique to increase everyday expressed gratitude to a romantic partner. Random assignment to the gratitude expression treatment (GET) increased the amount of time couples spent co-present in everyday life, from the weeks before GET to the weeks after, relative to the control condition. This effect was mediated by the change in expressed gratitude. Voluntary co-presence is an important behavioral indicator of close bonds in non-human animals. Further analyses with a functional genotype related to the oxytocin system (rs6449182) suggest a neurochemical pathway involved in the effects of expressing gratitude. Together, this evidence bridges animal and human research on bonding behavior and sets up future experiments on biopsychosocial mechanisms linking close bonds to health.