Taxi Drivers Rarely Die of Alzheimer’s—How Complex Mental Maps and Spatial Reasoning Protect Your Brain

A 2024 study discovered that taxi and ambulance drivers in the United States are less likely to die from Alzheimer’s disease than workers in most other jobs. Researchers analyzed nearly 9 million death certificates from January 2020 to December 2022, finding that roughly 1 in 100 taxi and ambulance drivers died of Alzheimer’s disease, compared to 1 in 60 people overall.

This pattern remained consistent even after adjusting for age, sex, race, ethnicity, and education. The study’s lead author hypothesized that the low Alzheimer’s risk among taxi and ambulance drivers stemmed from the constant real-time navigation required in their jobs—locating themselves in space, tracking destinations, and updating mental maps as conditions changed.

This navigational work likely engages the hippocampus, a brain region crucial for memory and spatial navigation, which is among the first areas to suffer damage in Alzheimer’s disease. London taxi drivers, who memorize over 25,000 streets within a 6-mile radius of Charing Cross, known as “The Knowledge,” showed increased gray matter in the posterior hippocampus—the brain area linked to storing large-scale spatial maps.

The more experience a driver had, the larger this region became. While researchers believe that spatial reasoning through real-life navigation protects against Alzheimer’s, future studies are needed to determine if similar cognitive benefits arise from work performed on a computer screen. Both mapmakers, urban planners, and geospatial analysts rely heavily on sustained spatial reasoning, and research suggests that complex environments force the brain to build cognitive maps, which may help delay cognitive decline and lower dementia risk.