Older drivers have higher rates of crashes per mile driven compared with most other drivers, and these crashes result in greater morbidity and mortality. Various aspects of cognition, particularly visual attention, have been linked with crash risk among older individuals. The current study was designed to specify those cognitive variables associated with specific on-road driving behaviours in a sample of older, nonclinic-referred individuals. 35 community-residing active drivers aged 72 years and older (M = 80) underwent a standardised, on-road driving evaluation involving parking lot manoeuvres, and urban, suburban, and highway driving. They were also administered tests of visual attention, executive function, visuospatial cognition, and memory. Driving score was significantly correlated with visual attention, visual memory, and executive function. Visual attention was associated with 25 of 36 driving behaviours, including those involving scanning the environment, interaction with traffic or pedestrians, and distance judgements. Executive function and visual memory were associated with fewer manoeuvres, most of which were a subset of manoeuvres that correlated with visual attention. Visual attention, a cognitive function involving search, selection, and switching, plays an important role in driving risk among older drivers. In the current study, key driving manoeuvres involving interaction with other vehicles/pedestrians, such as yielding right of way and negotiating safe turns or merges, have the greatest association with visual attention. Specification of both the cognitive risk factors and their impact on problematic driving manoeuvres may provide guidelines for developing targeted interventions to reduce risk among older adults. (Author/publisher)
Abstract