Corticolimbic structural connectivity encapsulates real-world emotional reactivity and happiness.

Emotional reactivity to everyday events predicts happiness, but the neural circuits underlying this relationship remain incompletely understood. Here, we combined experience sampling methods and diffusion magnetic resonance imaging to examine the association among corticolimbic structural connectivity, real-world emotional reactivity and daily experiences of happiness from 79 young adults (35 females). Participants recorded momentary assessments of emotional and happiness experiences five times a day for a week, approximately 2 weeks after brain scanning. Model-based emotional reactivity scores, which index the degree to which moment-to-moment affective state varies with the occurrence of positive or negative events, were computed. Results showed that stronger microstructural integrity of the uncinate fasciculus and the external capsule was associated with both greater positive and negative emotional reactivity scores. The relationship between these fiber tracts and experienced happiness was explained by emotional reactivity. Importantly, this indirect effect was observed for emotional reactivity to positive but not negative real-world events. Our findings suggest that the corticolimbic circuits supporting socioemotional functions are associated with emotional reactivity and happiness in the real world.

Paradoxical Impacts of Social Relationship on Well-Being During the COVID-19 Pandemic.

Social interaction is an important source of psychological and physical well-being during normal times. However, following the COVID-19 outbreak, which spreads rapidly from person to person, social interaction poses a fatal threat to one's health and life. Therefore, several countries including South Korea implemented an intense social distancing mandate to prevent the spread of the virus. During these unique times of pandemic, the current research investigated whether and how an individual's well-being varies as a function of their interaction with various relationship partners using experience sampling data (Study 1) and online longitudinal data (Study 2). The results indicated that being alone was more detrimental to well-being during the pandemic than before it. Specifically, interaction with close relationship partners (e.g., romantic partner, spouse, or friend) was positively related to well-being, whereas interaction with formal relationship partners (e.g., coworker, boss) was negatively linked to momentary well-being during the pandemic. Furthermore, our study showed that the association between social supports from close relationships and well-being was temporally strengthened during COVID-19 pandemic. In sum, the benefits of close relationships on well-being were stronger during the COVID-19 pandemic than before it.

Longitudinal examinations of changes in well-being during the early period of the COVID-19 pandemic: Testing the roles of extraversion and social distancing.

The present research, by using longitudinal data collected in South Korea (N = 69,986) during the early period of the COVID-19 pandemic (1 January-7 April 2020), examined the pandemic-related changes in the relationship between extraversion and well-being. Multilevel analyses revealed that participants experienced decreased well-being during the pandemic. When analyzing the responses (n = 3,229) completed during all the periods encompassing the COVID-19-related events (e.g., outbreak of COVID-19), we found the greater within-person decreases in well-being among extraverts than introverts after the intensive social distancing. This finding suggests that social distancing, as a necessary means to curb the spread of COVID-19, inadvertently reduced well-being of extraverts. Implications for the person-environment fit literature, limitations, and future research avenues are discussed.

How COVID-19 affected mental well-being: An 11- week trajectories of daily well-being of Koreans amidst COVID-19 by age, gender and region.

The present study examined the daily well-being of Koreans (n = 353,340) for 11 weeks during the COVID-19 pandemic (January 20 -April 7). We analyzed whether and how life satisfaction, positive affect, negative affect, and life meaning changed during the outbreak. First, we found that the well-being of Koreans changed daily in a cubic fashion, such that it declined and recovered during the early phase but declined substantially during the later phase (after COVID- 19 was declared world pandemic by WHO). Second, unlike other emotions, boredom displayed a distinctive pattern of linear increase, especially for younger people, suggesting that boredom might be, in part, responsible for their inability to comply with social distancing recommendations. Third, the well-being of older people and males changed less compared to younger people and females. Finally, daily well-being dropped significantly more in the hard-hit regions than in other regions. Implications and limitations are discussed.

Within-person day-of-week effects on affective and evaluative/cognitive well-being among Koreans.

Day-of-week (DOW) effects such as "blue Monday," "Thank God it's Friday" (TGIF), and weekend effects have mostly been investigated using a cross-sectional approach with Western samples and focusing on hedonic aspects of well-being. Using large-scale data (N = 859,749) containing multiple observations per person collected from Koreans, we examined various patterns of DOW effects on comprehensive measures of well-being. Unlike previous studies, we examined DOW effects at the within-person level. Blue Monday and TGIF effects were evident across affective and evaluative/cognitive aspects of well-being, and the Thursday nadir phenomenon was also found. The DOW effects were consistent for the affective well-being, whereas no weekend effects were observed for the cognitive aspects, including life satisfaction and meaning in life. The DOW effects were moderated by gender and age groups, with younger people tending to experience more salient DOW effects and women identifying fewer benefits from DOW effects. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Social Relatedness and Physical Health Are More Strongly Related in Older Than Younger Adults: Findings from the Korean Adult Longitudinal Study.

Previous research indicates that social relatedness is beneficial to physical health; however, findings on the relative strength of the relationship between these variables have been inconsistent. The present study employed cross-sectional survey (Study 1) and a daily diary survey (Study 2) to examine the link between social relatedness and physical health by age. Using a representative sample of Korean adults (N = 371) aged from 20 to 69, Study 1 examines the link between social relatedness (loneliness, perceived social support) and physical health (physical symptoms, chronic health conditions) using age as a moderator. The results show that participants' age moderates the association between social relatedness and physical health. Study 2 (N = 384) further corroborated the findings from Study 1 by showing that when controlling for the physical symptoms experienced prior to the daily diary reports, the level of loneliness experienced over a 13-day period exacerbates the age differences in the physical symptoms. The present study thus provides converging evidence that social relatedness plays a significant role in physical health, particularly in the older population.