How talking slows eye movements behind the wheel, suggests study

Now, researchers from Fujita Health University have demonstrated that talking imposes cognitive load strong enough to delay essential eye-movement responses, potentially affecting the fast visual assessments required for safe driving. A study led by Associate Professor Shintaro Uehara and the team, including Mr. Takuya Suzuki and Professor Takaji Suzuki, published online on October 6, 2025, in PLOS ONE, examined how talking alters the temporal dynamics of gaze behavior.

Gaze behavior is especially significant because approximately 90% of the information used for driving is acquired visually. Any delay in initiating or completing eye movements can cascade into slower recognition of hazards, reduced accuracy of visual scanning, and delayed motor responses. “We investigated whether the impact of talking-related cognitive load on gaze behavior varies depending on the direction of eye movement,” explains Dr. Uehara.

To investigate this, the researchers asked 30 healthy adults to perform rapid center-out eye-movement tasks under three different conditions: talking, listening, and a no-task control. Participants were instructed to look as quickly and accurately as possible toward a peripheral visual target presented in one of eight directions. In the talking condition, participants answered general knowledge and episodic questions adapted from the Wechsler Adult Intelligence Scale and additional custom prompts. In the listening condition, participants listened to passages from the Japanese novel I Am a Cat. The order of conditions was randomized across three separate days. Across all participants, talking produced clear and consistent delays in three key temporal components of gaze behavior: the time needed to initiate the eye movement after target appearance (reaction time), the time needed to reach the target (movement time), and the time needed to stabilize gaze on the target (adjusting time). None of these effects were observed during listening or control conditions, suggesting that the act of talking and the cognitive effort required to search for and produce verbal answers create meaningful interference with gaze control mechanisms.

These delays appear small in isolation, but during driving, they may accumulate into slower detection of hazards and delayed initiation of physical responses. Even hands-free conversations may introduce a cognitive load strong enough to interfere with the neural processes that initiate and guide eye movements. Because drivers often need to look downward toward pedestrians, debris, or objects on the road, these delays highlight the broad risks of conversation during visually demanding driving scenarios.

The authors note that their findings do not imply that talking is the sole or dominant cause of slowed physical reactions behind the wheel. Driving performance is influenced by multiple cognitive and perceptual factors, including inattentional blindness, divided attention, and the broader interference that occurs when the brain is forced to manage two demanding tasks at once. Even so, the study demonstrates that talking introduces delays at the earliest stage of visual processing before recognition, decision-making, or physical action, which means it may quietly undermine driving performance in ways that are not immediately obvious to drivers themselves. “These results indicate that the cognitive demands associated with talking interfere with the neural mechanisms responsible for initiating and controlling eye movements, which represent the critical first stage of visuomotor processing during driving,” concludes Dr. Uehara.

These insights carry meaningful implications for public safety. By understanding that the cognitive effort involved in conversation can degrade gaze accuracy and timing, drivers may become more mindful about when and how they choose to talk while driving. Over time, this knowledge could support safer driving behaviors, inform driver-training frameworks, inspire improvements in vehicle interface design, and guide policymakers in shaping future recommendations around cognitive distraction.

Reference:

Takuya Suzuki, Takaji Suzuki, Shintaro Uehara, Talking-associated cognitive loads degrade the quality of gaze behavior, PLOS One, https://doi.org/10.1371/journal.pone.0333586