Recent research indicates that the driving behaviors of elderly individuals could serve as early indicators of dementia. Scientists suggest that the way older people drive may offer insights into their brain health.
A study revealed a connection between higher white matter damage in the brain and changes in driving habits, such as reduced driving frequency, sticking to familiar routes, and increased driving errors, particularly in those who later developed dementia. However, seniors aged 65 and above who were on blood pressure medication showed fewer risky driving behaviors, even with existing brain damage.
Researchers from the United States found that subtle alterations in daily driving routines could signify early signs of brain changes and a heightened risk of dementia, even before noticeable memory and cognitive symptoms emerge. The study tracked 220 drivers with an average age of 73 over a five-year period in St. Louis, Missouri, all of whom were dementia-free at the study’s onset.
Data was collected between 2016 and 2024, monitoring participants’ driving metrics like trip frequency, distance, destinations, and safety incidents such as speeding, collisions, hard braking, and cornering. MRI brain scans were conducted at the beginning of the study.
Nearly half of the participants underwent a second MRI scan at least a year after the initial one, along with annual clinical and cognitive assessments. The study examined the correlation between total and regional white matter hyperintensities and driving patterns and safety measures.
Professor Chia-Ling Phuah from the Barrow Neurological Institute in Phoenix emphasized the significance of older adults’ driving habits in detecting early brain health changes. She noted that variations in daily driving routines could indicate underlying white matter brain damage, which is associated with cognitive decline and dementia.
Among the participants who developed cognitive impairment, those with higher white matter hyperintensity burden on brain imaging exhibited more unsafe driving practices, like hard braking and increased crash rates. Participants with hyperintensities in the brain’s posterior region, responsible for visual processing and movement coordination, were at higher risk of accidents compared to those with changes in other brain areas.
Individuals on high blood pressure medications, particularly ACE inhibitors, demonstrated fewer risky driving behaviors compared to those not on such medication. The study suggests that monitoring driving behaviors using in-vehicle data loggers could help identify older drivers at a higher risk of unsafe driving practices, loss of independence, and subtle cognitive impairments.
Professor Phuah highlighted a significant finding that individuals taking blood pressure medications, notably ACE inhibitors, tended to maintain safer driving habits, even with evident brain damage. This effect was consistent regardless of their blood pressure levels, indicating a potential role of these medications in supporting brain health during aging.
Larry Duncan, a retired business owner from North Carolina, experienced subtle changes in his driving prior to his Alzheimer’s diagnosis in 2023. His wife, Pam, noted his difficulties in unfamiliar driving situations as one of the early signs. As his cognitive challenges progressed, Duncan’s doctor advised him to stop driving, a decision that was emotionally challenging yet necessary for his safety.
The study findings are scheduled for presentation at the upcoming American Stroke Association’s International Stroke