Effects of an Unexpected and Expected Event on Older Adults’ Autonomic Arousal and Eye Fixations During Autonomous Driving

Abstract

Driving cessation for some older adults can exacerbate physical, cognitive, and mental health challenges due to loss of independence and social isolation. Fully autonomous vehicles may offer an alternative transport solution, increasing social contact and encouraging independence. However, there are gaps in understanding the impact of older adults' passive role on safe human-vehicle interaction, and on their well-being. 37 older adults (mean age ± SD = 68.35 ± 8.49 years) participated in an experiment where they experienced fully autonomous journeys consisting of a distinct stop (an unexpected event versus an expected event). The autonomous behavior of the vehicle was achieved using the Wizard of Oz approach. Subjective ratings of trust and reliability, and driver state monitoring including visual attention strategies (fixation duration and count) and physiological arousal (skin conductance and heart rate), were captured during the journeys. Results revealed that subjective trust and reliability ratings were high after journeys for both types of events. During an unexpected stop, overt visual attention was allocated toward the event, whereas during an expected stop, visual attention was directed toward the human-machine interface (HMI) and distributed across the central and peripheral driving environment. Elevated skin conductance level reflecting increased arousal persisted only after the unexpected event. These results suggest that safety-critical events occurring during passive fully automated driving may narrow visual attention and elevate arousal mechanisms. To improve in-vehicle user experience for older adults, a driver state monitoring system could examine such psychophysiological indices to evaluate functional state and well-being. This information could then be used to make informed decisions on vehicle behavior and offer reassurance during elevated arousal during unexpected events.

Studying Driver’s Perception Arousal and Takeover Performance in Autonomous Driving

“…Theus, the perception level of the driver was improved where it is conducive to increasing the response ability and making preparation for taking over the autonomous vehicle. Stephenson et al [40] found that the skin conductance level of drivers increased after triggering the takeover request, indicating that the drivers' perception was aroused. To sum up, after the takeover request is triggered, the perception level of drivers will increase.…”

Az önvezető járművek elfogadásának társadalomtudományi vetületei : Kutatási lehetőségek és módszertani korlátok

“…A viselkedési horgonyok közül első a Technológiai Én-hatékonyság, második az Észlelt külső kontroll, harmadik a Technológiai szorongás, negyedik pedig a Technológia játékossága (Strauch et al, 2019). A korrekciós tényezők az észlelt élvezeti érték, és az objektív használhatóság (Stephenson et al, 2020).…”

A user study of directional tactile and auditory user interfaces for take-over requests in conditionally automated vehicles

“…Stephenson et al also explored older adults' autonomic arousal and found that safety-critical events (such as TORs) may narrow their visual attention and elevate arousal mechanisms (Stephenson et al, 2020). Furthermore, increasing the level of automation does not seem to decrease driving performance; on the contrary, it may even provide a safer drive among drivers with limited experience with the technology (Weaver et al, 2020).…”