Healthy aging has been associated with declines in executive functioning (EF) but it remains unclear how different subprocesses of EF are affected by age and by other possibly mediating variables. The principal aim of the present study was to investigate the effects of age and processing speed on three executive functions: set-shifting, planning, and attentional control. Four age groups (20-29 years, 60-69 years, 70-79 years, and 80-89 years) were compared on the Wisconsin Card Sorting Test (WCST), the DKEFS Tower Test, the Conner's Continuous Performance Test, and a Letter comparison test of processing speed. Results suggested that increased age was associated with decreased performance on most of the studied executive measures, but not all EF are equally affected by age. A slowdown in processing speed mediates some, but not all, decrements in executive performance. The results are interpreted in light of recent neuroimaging data on age-related changes in brain functioning. / by Maria Beatriz Jurado Noboa. / Thesis (M.A.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

Doctorat en sciences psychologiques / info:eu-repo/semantics/nonPublished

Older Americans will comprise 22.9% of the population by the year 2050 (U.S. Bureau of the Census, 1989). The literature has focused attention on the informal networks and leisure activities of the older adult. Most older adults have an effective network of close relationships with family and friends.Schein (1985) suggests that impaired hearing reduces communication resulting in social withdrawal and diminished participation in leisure activities. Only recently has research addressed the impact of subjective memory impairment. The literature on self-reported memory complaints and objective measures of performance are mixed.The purpose of this study was to better understand the role self-reported hearing impairment and memory impairment have on the social contact and leisure activities of community adults. Results indicate that gender is a significant indicator of social contact. The hypothesis that individuals reporting memory difficulties would differ significantly in social contact and leisure activities from unimpaired individuals was supported. No significant multivariate effect appeared for hearing on social contact or leisure activities. / Department of Counseling Psychology and Guidance Services