Talking to your car can drive you to distraction

Strayer, DL; Cooper, JM; Hopman, RJ; Coleman, JR; Hopman, RJ · 2016 · publications_jsonl

DOI: 10.1186/s41235-016-0018-3

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Summary

This study investigates the cognitive workload and distraction caused by interacting with in-vehicle information systems (IVIS) using voice commands. While voice-activated features are marketed as safer alternatives to manual controls because they keep eyes on the road and hands on the wheel, prior research indicated that even "perfect" speech recognition systems impose significant mental demands. This research specifically addressed two gaps: whether older drivers experience higher workload than younger drivers, and whether five days of practice with the system reduces this cognitive interference. The researchers conducted a weeklong evaluation involving 257 participants aged 21 to 70, divided into three age groups. Participants drove one of ten different 2015 model-year vehicles equipped with various voice-command systems. The experimental design included an initial assessment of cognitive workload, followed by five days of home practice with the vehicle, and a final reassessment. Cognitive workload was measured using a Detection Response Task (DRT), which monitored reaction times and hit rates to peripheral visual stimuli, alongside subjective NASA TLX surveys. Participants performed specific IVIS tasks, including contact calling, number dialing, and radio tuning, while driving a standardized suburban route. The results demonstrated that IVIS interactions impose moderate to high cognitive workload, averaging 3.34 on a 5-point scale. This workload was significantly higher for older drivers compared to younger drivers performing the same tasks. Crucially, the five days of practice did not eliminate the distraction; tasks that were difficult initially remained difficult after practice. The study also identified long-lasting residual costs, where cognitive impairment persisted even after the voice interaction had ended. Performance metrics, including slower reaction times and missed detections in the DRT, confirmed that these interactions significantly degrade driving performance. The findings imply that voice-based IVIS interactions are cognitively demanding and should not be used indiscriminately while driving. The lack of improvement with practice suggests that the complexity and unintuitiveness of current systems prevent drivers from automating these tasks. Furthermore, the heightened risk for older drivers highlights a critical safety concern, as this demographic is increasingly likely to purchase vehicles with these features. The study concludes that despite the hands-free nature of voice commands, the mental load required to manage these systems poses a substantial distraction risk comparable to or exceeding other known secondary tasks.

Key finding

Voice-activated in-vehicle information system interactions impose moderate to high cognitive workload that does not diminish with practice and is significantly more demanding for older drivers.

Methodology

on_road

Sample size: 257

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• mental demand
• voice interaction
• auditory

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• Applied Guidance: design guidelines
• Empirical Findings: self report data
• Theoretical Contribution: theory or model