References of "Kandler, Christian"
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See detailGenetic and environmental variation in political orientation in adolescence and early adulthood: A Nuclear Twin Family Analysis.
Hufer, Anke; Kornadt, Anna Elena UL; Kandler, Christian et al

in Journal of Personality and Social Psychology (2020), 118(4), 762-766

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See detailSound Body, Sound Mind? The Interrelation Between Health Change and Personality Change in Old Age
Kornadt, Anna Elena UL; Hagemeyer, Birk; Neyer, Franz J. et al

in EUROPEAN JOURNAL OF PERSONALITY (2018), 32(1), 30-45

Personality development is characterized by increasing maturation, that is, people become more conscientious, agreeable and emotionally stable as they age. In late life, however, these trends seem to be ... [more ▼]

Personality development is characterized by increasing maturation, that is, people become more conscientious, agreeable and emotionally stable as they age. In late life, however, these trends seem to be reversed. Because many changes and transitions in older age are related to health, we investigated correlated changes in health problems and personality traits, the sources of health changes in later life and the directionality of effects. Our sample consisted of older adult twins, aged 64-85years at time 1 (n=410; 135 male/275 female; 134 monozygotic/63 dizygotic twin pairs), assessed at two different time points about five years apart, and we ran bivariate latent change and latent change twin model analyses. Increasing health problems were associated with decreases in agreeableness, extraversion, emotional stability and conscientiousness. Changes in health problems were only due to environmental influences, implying that the association between health and personality changes was exclusively environmental. Directional effects were largely absent, but health and personality were significantly related at the second measurement occasion (age 69-89years). Our results support the link between health change and personality change in late life and spark the assumption of normative personality adaptations to deterioration of health status as a means of developmental regulation. Copyright (c) 2017 European Association of Personality Psychology [less ▲]

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See detailOn the genetic and environmental sources of social and political participation in adolescence and early adulthood
Kornadt, Anna Elena UL; Hufer, Anke; Kandler, Christian et al

in PLOS ONE (2018), 13(8),

Political participation (POP), social participation (SOP), and political interest (PI) are important indicators of social status and social inequality. Previous studies on related trait differences ... [more ▼]

Political participation (POP), social participation (SOP), and political interest (PI) are important indicators of social status and social inequality. Previous studies on related trait differences yielded genetic and environmental contributions. However, focusing on adult samples, classical twin designs, and convenience samples often restricts parameter estimation and generalizability, and limits the understanding of age differences. We investigated sources of variance in POP, SOP, and PI in late adolescence and early adulthood with an extended twin family design (ETFD). We analyzed data from over 2,000 representative German twin families. Individual environments not shared by family members reflected the major source of variance for all variables, but genetic influences were also pronounced. Genetic effects were mostly higher for young adults, whereas effects of twins' shared environment were significant in adolescence. Our study deepens the understanding of the interplay between genetic and environmental factors in shaping differences in young persons' integration in society. [less ▲]

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See detailGenetic and Environmental Sources of Individual Differences in Views on Aging
Kornadt, Anna Elena UL; Kandler, Christian

in PSYCHOLOGY AND AGING (2017), 32(4), 388-399

Views on aging are central psychosocial variables in the aging process, but knowledge about their determinants is still fragmental. Thus, the authors investigated the degree to which genetic and ... [more ▼]

Views on aging are central psychosocial variables in the aging process, but knowledge about their determinants is still fragmental. Thus, the authors investigated the degree to which genetic and environmental factors contribute to individual differences in various domains of views on aging (wisdom, work, fitness, and family), and whether these variance components vary across ages. They analyzed data from 350 monozygotic and 322 dizygotic twin pairs from the Midlife Development in the U.S. (MIDUS) study, aged 25-74. Individual differences in views on aging were mainly due to individual-specific environmental and genetic effects. However, depending on the domain, genetic and environmental contributions to the variance differed. Furthermore, for some domains, variability was larger for older participants; this was attributable to increases in environmental components. This study extends research on genetic and environmental sources of psychosocial variables and stimulates future studies investigating the etiology of views on aging across the life span. [less ▲]

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See detailGENETIC AND ENVIRONMENTAL SOURCES OF VIEWS ON AGING: AGE- AND DOMAIN-SPECIFIC ANALYSES
Kornadt, Anna Elena UL; Kandler, Christian

in GERONTOLOGIST (2016), 56(3), 503-503

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See detailPatterns and Sources of Personality Development in Old Age
Kandler, Christian; Kornadt, Anna Elena UL; Hagemeyer, Birk et al

in JOURNAL OF PERSONALITY AND SOCIAL PSYCHOLOGY (2015), 109(1), 175-191

Despite abundant evidence that personality development continues in adulthood, little is known about the patterns and sources of personality development in old age. We thus investigated mean-level trends ... [more ▼]

Despite abundant evidence that personality development continues in adulthood, little is known about the patterns and sources of personality development in old age. We thus investigated mean-level trends and individual differences in change as well as the genetic and environmental sources of rank-order continuity and change in several personality traits (neuroticism, extraversion, openness, agreeableness, conscientiousness, perceived control, and affect intensity) and well-being. In addition, we analyzed the interrelation between perceived control and change in other personality traits as well as between change in personality traits and change in well-being. We analyzed data from older adult twins, aged 64-85 years at Time 1 (N = 410; 135 males and 275 females; 134 monozygotic and 63 dizygotic twin pairs), collected at 2 different time points about 5 years apart. On average, neuroticism increased, whereas extraversion, conscientiousness, and perceived control significantly decreased over time. Change in perceived control was associated with change in neuroticism and conscientiousness, pointing to particular adaptation mechanisms specific to old age. Whereas individual differences in personality traits were fairly stable due to both genetic and environmental sources, individual differences in change were primarily due to environmental sources (beyond random error) indicating plasticity in old age. Even though the average level of well-being did not significantly change over time, individual well-being tended to decrease with strongly increasing levels of neuroticism as well as decreasing extraversion, conscientiousness, and perceived control, indicating that personality traits predict well-being but not vice versa. We discuss implications for theory on personality development across the lifespan. [less ▲]

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