Leukoaraiosis Significantly Worsens Driving Performance of Ordinary Older Drivers
DOI: 10.1371/journal.pone.0108333
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Summary
This study investigates the specific impact of leukoaraiosis (LA), a condition characterized by vacuous lesions in the brain’s white matter, on the driving performance of older adults. While previous research established a significant association between LA and traffic crashes, the underlying mechanisms remained unclear. The authors aimed to determine whether LA directly impairs driving skills, particularly under conditions of distraction, by comparing older drivers with and without LA against a young control group. The experimental design involved 33 participants divided into three groups: young drivers (20s, N=9), older drivers without LA (G0, N=11), and older drivers with severe LA (G2, N=13). LA severity was determined via MRI scans. Participants underwent actual-vehicle driving examinations on a standard course at a driver’s license center. To simulate cognitive load and distraction, drivers performed a Paced Auditory Serial Addition Test (PASAT) during driving. Performance was evaluated using two metrics: a standardized driver skill rating by official examiners, which recorded normal and critical operation errors, and steering entropy analysis, which quantified the smoothness of steering operations using 6-axis accelerometers. The results demonstrated that LA significantly worsens driving performance, specifically by increasing vulnerability to distraction. While all groups showed decreased accuracy on the PASAT during driving, there were no significant differences in PASAT scores between groups. However, critical operation errors, such as failing to stop at signs, were significantly higher in the G2 group compared to the G0 group when distracted. Steering entropy analysis revealed that G2 drivers exhibited significantly rougher steering and higher entropy values during right turns under PASAT load compared to G0 drivers. Regression analysis indicated a stronger correlation between steering entropy and operation errors when distraction was present, suggesting that LA compromises the smoothness and safety of vehicle control when attention is divided. The study concludes that leukoaraiosis impairs driving performance not necessarily by reducing general cognitive ability, but by reducing the brain’s capacity to maintain smooth, safe operations under distracting conditions. The damage to white matter connectivity likely hinders the attentional resources required for complex driving tasks. These findings provide a mechanistic explanation for the previously observed link between LA and traffic crashes, identifying older drivers with LA as a high-risk group due to their heightened susceptibility to distraction. The authors suggest that further research in real-world traffic conditions and the development of driving assistance systems are necessary to address these safety concerns.
Key finding
Older drivers with leukoaraiosis demonstrate significantly worse driving performance, including more operation errors and rougher steering, than older drivers without the condition, especially when subjected to cognitive distraction.
Methodology
on_road
Sample size: 33
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-08.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-08 |
| archive | success | canonical_url | — | — | 1 | 2026-06-04 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | success | semantic_scholar | — | — | 2 | 2026-06-04 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: behavioral performance data
- Theoretical Contribution: computational model