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Effects of working memory load and repeated scenario exposure on emergency braking performance

Johan Engström ; Mikael Ljung Aust (Institutionen för tillämpad mekanik, Fordonssäkerhet) ; Matias Viström (Institutionen för tillämpad mekanik, Fordonssäkerhet)
Human Factors (0018-7208). Vol. 52 (2010), 5, p. 551-559.
[Artikel, refereegranskad vetenskaplig]

Objective: The objective of the present study was to examine the effect of working memory load on drivers' responses to a suddenly braking lead vehicle and whether this effect (if any) is moderated by repeated scenario exposure. Background: Several experimental studies have found delayed braking responses to lead vehicle braking events during concurrent performance of nonvisual, working memory-loading tasks, such as hands-free phone conversation. However, the common use of repeated, and hence somewhat expected, braking events may undermine the generalizability of these results to naturalistic, unexpected, emergency braking scenarios. Method: A critical lead vehicle braking scenario was implemented in a fixed-based simulator. The effects of working memory load and repeated scenario exposure on braking performance were examined. Results: Brake response time was decomposed into accelerator pedal release time and accelerator-to-brake pedal movement time. Accelerator pedal release times were strongly reduced with repeated scenario exposure and were delayed by working memory load with a small but significant amount (178 ms). The two factors did not interact. There were no effects on accelerator-to-brake pedal movement time. Conclusion:The results suggest that effects of working memory load on response performance obtained from repeated critical lead vehicle braking scenarios may be validly generalized to real world unexpected events. Application: The results have important implications for the interpretation of braking performance in experimental settings, in particular in the context of safety-related evaluation of in-vehicle information and communication technologies. © 2010, Human Factors and Ergonomics Society.

Nyckelord: attentional processes, brake response time, dual-task performance, repeated scenario exposure, working memory load

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Denna post skapades 2011-01-18. Senast ändrad 2017-08-17.
CPL Pubid: 134764


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Institutionen för tillämpad mekanik, Fordonssäkerhet (2005-2017)


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