Perceived control is associated with health throughout adulthood, yet has also been found to decline with age possibly due to age-related experiences of increasing losses and limitations in life circumstances. Perceived control may also be affected by individual personality characteristics, which also predict health through late adulthood. Although previous studies have addressed these associations, research is lacking in examining nuanced associations among personality, perceived control, and health all together as well as age and gender differences in these associations. Moreover, perceived control may be related to individualistic values (e.g., autonomy, agency) that vary cross-culturally and the implications of perceived control as well as personality for health may differ in distinct cultures. However, cross-cultural research on longitudinal associations of personality, perceived control, and health is further limited. In order to address the gap in the literature, the present dissertation, consisting of three studies, focuses on investigating longitudinal associations among personality, perceived control, and health for American and Japanese middle-aged and older adults. The first two studies address longitudinal associations between personality and perceived control (Study 1) and the potential mediation of perceived control for longitudinal associations between personality and health (Study 2) for 4,611 American adults (aged 40 to 75 at baseline). Study 3 examines associations among personality, perceived control, and health for 827 Japanese adults (aged 40 to 79 at baseline) in contrast to Americans. The findings suggest that neuroticism and conscientiousness are consistent predictors for perceived control over time and that perceived control mediates longitudinal associations of neuroticism and conscientiousness with functional health for American adults. Such mediation was not found for Japanese adults despite overall similar tendencies except for associations between personality and perceived control. No age differences in associations among personality, perceived control, and health were found for both nationalities (who were in their 40s to 70s at baseline) while there were some gender differences in a limited few associations for Americans. The dissertation contributes to the literature by furthering the understanding of longitudinal associations of personality, perceived control, and health and indicating future directions for research including exploring potential avenues to promoting health through perceived control.

Although professionals in psychiatry, psychology and medicine claim to endorse the biopsychosocial model as proposed by George L. Engel (1977), clinicians in all three fields still tend to underutilize it. Some academics have also criticized the model for its inadequate emphasis on cultural contextualization. To improve upon the model, I sought to empirically establish the relationship between culturally-specific social factors and psychological disorder, in this case depressive symptoms in Mexican-American adults. Eighty-six Mexican-American participants living on the US-Mexico border completed scales measuring depressive symptoms, bidirectional acculturation, living situation, diabetes, and health beliefs regarding the origins of diabetes. The results revealed that diabetes, acculturation, and gender were not associated with depressive symptoms in this population, even when controlling for mental health biases. This finding is in contrast to findings from other literature that associated diabetes, low acculturation and gender with depression in Hispanic adults. Extended family cohabitation was also not associated with lower numbers of depressive symptoms, despite the importance of familism and the extended family unit in Mexican-American culture. Unemployment was significantly related to number of depressive symptoms in both genders. There was no significant relationship between acculturation and health beliefs. These results indicate the importance of studying psychological disorders within the context of specific population groups that transcend vague censual terms. The discussion addresses methodological concerns and further directions for research concerning gender roles, chronic illness, depression and out-of-home employment in Mexican-American adults.

The film is about three young Korean-American adults who have adapted to American society while retaining certain aspects of Korean culture in their lives. To expose their intermingled behaviors and concepts, the film combines the observational format of a documentary with an information style employing family photos, home movie recordings, and interviews with the three subjects and their families. An accompanying production report describes the research process, pre-production, production, and post-production.