Age-Related Differences in Vehicle Control and Eye Movement Patterns at Intersections: Older and Middle-Aged Drivers
DOI: 10.1371/journal.pone.0164124
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Summary
This study investigates age-related differences in vehicle control and eye movement patterns, specifically focusing on why older drivers exhibit reduced scanning behaviors at intersections compared to middle-aged drivers. The research is motivated by the elevated crash risk for older adults at intersections and previous findings that active training can double the frequency of secondary glances (scans after entering an intersection) among older drivers. This suggests that the deficit may stem from difficulties in coordinating simultaneous motor and visual tasks rather than irreversible functional decline. The authors propose a "decoupling hypothesis," suggesting older drivers struggle to coordinate head/eye movements with steering inputs simultaneously, leading them to neglect lateral scans. To test this, twelve older drivers (mean age 76) and twelve middle-aged drivers (mean age 58) participated in a driving simulator study. The experiment comprised two tasks. Task 1 involved navigating eight intersection scenarios requiring secondary glances to detect potential hazards obscured by road geometry or environment. Task 2 was a visual search task where participants identified targets on side displays while driving on a highway, under three conditions: static baseline, driving without wind turbulence, and driving with lateral wind turbulence to increase steering workload. Eye movements were tracked using a head-mounted eye tracker, and vehicle control was monitored via simulator data. The results replicated previous findings that older drivers executed significantly fewer correct secondary glances at intersections than middle-aged drivers. In the visual search task, older drivers performed more poorly than their middle-aged counterparts when driving concurrently with the search task. Specifically, older drivers required more steering corrections and showed degraded visual search performance. The presence of wind turbulence further increased the difficulty of vehicle control, exacerbating the performance gap. However, in the static baseline condition where no driving was required, older and middle-aged drivers demonstrated comparable visual search performance. These findings support the decoupling hypothesis, indicating that older drivers’ failure to scan at intersections is likely due to the cognitive and motor costs of coordinating simultaneous head/eye movements and vehicle steering. The results suggest that the deficit is not a fixed perceptual decline but a limitation in managing concurrent tasks. This explains why active training, which teaches drivers to phase these actions (scanning before turning), is effective. The study implies that interventions targeting the coordination of motor and visual tasks, rather than just hazard perception, may be crucial for improving intersection safety among older drivers.
Key finding
Older drivers executed fewer secondary glances at intersections and demonstrated poorer performance on concurrent visual search and steering tasks compared to middle-aged drivers, indicating difficulties in coordinating simultaneous visual and motor actions.
Methodology
simulator
Sample size: 24
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 2026-05-28.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-28 |
| 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 | — | — | — | 1 | 2026-05-28 |
| 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.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- looked but failed to see
- eye movements scanning
- temporal
- visual
- useful field of view
- attention allocation
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Empirical Findings: behavioral performance data
- Methodological Resource: measurement protocol, tool software