The relationship between cognitive/neuropsychological factors and car driving performance in older adults

OBJECTIVES: Because demographic changes produce a society with a growing nu mber of older people, seniors constitute the fastest growing segment of car drivers. The objective of this research project was to identify cognitive factors related to driving problems in older adults. A top-down approach ha s been used, testing theory-driven hypotheses. DESIGN: Correlational study. SETTING: Fitness-to-Drive Assessment Centre of the Belgian Road Safety Inst itute. PARTICIPANTS: The research sample consisted of 84 car drivers aged over 65 years, who were referred for a general fitness-to-drive evaluation. MEASUREMENTS: The relations between seven specific neuropsychological tests and self-reported accidents were investigated. Furthermore, the relations between these same tests and a road test, independently assessed using a de tailed evaluation grid, were analyzed in depth. These analyses were followe d by stepwise multiple regression analyses. RESULTS: In a stepwise regression model, four neuropsychological tests coul d account for 64% of the variance of the score on the road test. Moreover, it could be demonstrated. that specific cognitive subskills share common va riance with specific real-world situations. However, neuropsychological tes ts could explain only 19% of the variance of self-reported at fault car acc idents. CONCLUSIONS: The initial results of this study indicate the relevance of a cognitive/neuropsychological approach to the driving ability of older peopl e. However, the link with accident risk seems more complex. Consequently, n europsychological screening procedures are in need of a broader perspective to prevent an overemphasis on unidimensional screening procedures focusing mainly on deficit and less on capacities for safe behavior.