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Poster communications

Collision avoidance strategies in older adults

Abstract : Introduction: In the younger adult (YA) population, collision avoidance has been found to be a collaborative process between two walkers. Further, the crossing order of two walkers, whether one crosses in front of or behind the other individual, is preserved during the interaction and impacts adaptive strategies used during locomotion. While these findings are consistent when analyzing YA, it is unknown whether these same anticipatory and adaptive strategies exist during collision avoidance in older adult (OA). The current study aims to identify whether differences in collision avoidance behaviours of OA during a person-person collision avoidance task are the result of age-related visuomotor processing deficits. Hypothesis: It is hypothesized that OA will have delayed visuomotor processing leading to different adaptations. Methods: Eighteen OA (age 65-74) and eighteen YA (age 18-30) walk from one end to the opposite end of a 15 *15 m experimental area. During a single session, three YA and three OA participate in 141 walking trials resulting in YA/YA, YA/OA and OA/OA interactions. We analyzed participants’ trajectories and computed number of crossing order inversions as well as clearance distance. Results: There were more crossing order inversion as well as smaller clearance distance in OA/OA interactions in comparison with YA/YA or YA/OA interactions. Discussion/Conclusion: Although OA have similar and correct avoidance strategies as YA, their avoidance onset occurs later (i.e. closer to the other person), suggesting it is most likely due to delays in their visual processing, resulting in these different actions.
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Contributor : Anne-Hélène Olivier <>
Submitted on : Thursday, November 21, 2019 - 10:39:53 AM
Last modification on : Saturday, July 11, 2020 - 3:15:10 AM


  • HAL Id : hal-02373665, version 1


Robyn Grundberg, Michael Cinelli, Sheryl Bourgaize, Armel Crétual, Anne-Hélène Olivier. Collision avoidance strategies in older adults. SOFPEL 2019 - 26ème congrès de la Société Francophone Posture, Équilibre et Locomotion, Dec 2019, Montréal, Canada. ⟨hal-02373665⟩



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