The Impact of Physical Environment on the Cognitive Function of the Elderly: A Scoping Review of Cohort Studies

This review examined whether the physical environment can change the cognitive function of the elderly and categorized the specific environmental types. Four databases, CINAHL, Embase, PubMed, and PsycINFO, were searched for relevant literature published as of December 2020. The framework used was proposed by Arksey and O'Malley, which includes a 5-stage review process. A total of 12 studies were examined. The physical environments with similar characteristics, among all the environmental elements, were grouped together into 4 categories: residential density and road connectivity, limited living space, urban/rural, and care facilities. Residential density and road connectivity, limited living space, and care facilities were found to have a significant effect on the cognitive function of the elderly. However, there was no significant effect on the cognitive function of the elderly when comparing the urban and rural environments. Although studies on environments that affect the cognitive function of the elderly are still ongoing, the ones analyzing specific environments in detail are insufficient. With the increasing importance of the role played by the environment in the cognitive impairment of the elderly, detailed studies on specific environments among the various environmental factors surrounding the elderly, such as this study, should be conducted more actively.