Age-related changes in gaze sampling strategies during obstacle navigation

Domínguez-Zamora, F. Javier; Lajoie, Kim; Miller, Andreas B.; Marigold, Daniel S.

doi:10.1016/j.gaitpost.2019.11.015

Cited by 11 publications

(15 citation statements)

References 28 publications

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“…Unlike previous studies [1][2][3][4][5] which have not included the safety margin in their analyses, we found that the right and left safety margins combined accounted for 26% of the variance in decision making related to path planning. Research 14,15 has demonstrated that individuals tend to initiate an avoidance behavior 4 m from an obstacle.…”

Section: Discussioncontrasting

confidence: 99%

“…This procedure allowed us to objectively measure the deviation angle to the target. This differs from the procedures used in previous studies 1,4 which used an assumed straight-line path to the target. Our findings using the deviation angle showed that participants selected a path to the target that had the smallest deviation angle (Figure 4B).…”

Section: Discussionmentioning

confidence: 93%

“…This study examined obstacle avoidance strategies in response to stationary obstacles. The unique contributions of the present study on obstacle avoidance were the investigation of the role of the safety margin on path selection, the objective measurement of a baseline pathway to the target which has not previously been provided by research on the topic of obstacle avoidance 1,4,11 , and the analysis of gaze characteristics dependent on the safety margin, target, and obstacle relationship to the start position.…”

Section: Discussionmentioning

confidence: 99%

“…Gazes on the safety margin area are useful for this purpose. While other studies 4,19,20 have generally showed gaze data is used for safe travel during obstacle avoidance, our analyses specified the magnitude for use of gazes in terms of both density and sequencing according to safety margins, path, and target area. Results of the gaze sequence similarity scores (Table 3) showed that when there was an obstacle in the path to the target, and there was a decrease in the width of the safety margin, a different gaze sequence pattern was used by participants.…”

Section: Discussionmentioning

confidence: 99%

“…In the present study, the safety margin was defined as the distance between the outer edge of an obstacle and the edge of the pathway. While previous studies have manipulated deviation angle and/or minimum distance for path planning [1][2][3][4][5] , in the present study we also considered safety margin as a factor for decision making related to path planning.…”

Section: Introductionmentioning

confidence: 99%

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Target Position and Safety Margin Effects on Path Planning in Obstacle Avoidance

Saeedpour-Parizi

Hassan

Azad

et al. 2021

Preprint

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This study examined how people choose their path to a target, and the visual information they use for path planning. Participants avoided making contact with an obstacle as they walked to a bookcase and picked up a cup from different locations on a shelf. Participants chose a path with a smaller deviation angle from a straight line to the target and chose a side of the obstacle which was closer to them. Unlike previous studies which have not included a safety margin in their analyses, we found that the right and left safety margins combined to account for 26% of the variability in path planning decision making. In some cases, participants chose a longer path around the obstacle even when the available safety margin which would have resulted in a straight line to the target was large enough to allow passage. Gaze analysis findings showed that participants directed their gaze to minimize the uncertainty involved in successful task performance and that gaze sequence changed with obstacle location. Early in their walk to the target, the greatest allocation of gaze was on the safety margin and target, later in their walk, gaze shifted to the safety margin when it was small, and then gaze shifted primarily to the target after the participant passed the obstacle. Our results of a path selection judgment test showed that the threshold for participants abandoning their preferred side for circumventing the obstacle was 15 cm to the left of the bookcase shelf center.

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