Route selection in barrier avoidance.
Brittany A Baxter, William H Warren
PMID 32526616WHAT IT FOUND
When avoiding barriers, people choose which end to pass by weighing how close it is against how much it deviates from their goal.
These local visual cues predict route choice better than calculating the total length or curvature of the path.
Key findings
01Participants preferred routes that minimized the distance to the barrier end and the deviation angle from the goal, rather than choosing the path with the least total curvature or shortest length.
02When the closer barrier end and the end with the smaller deviation angle were different, participants traded off these two factors, tending to follow the smaller deviation angle unless the distance difference was large.
03A relative deviation angle of 1.65 degrees was behaviourally equivalent to a relative distance of 0.75 meters in determining route choice.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted in a virtual environment using a head-mounted display, which may not fully replicate real-world visual and physical constraints. Participants were healthy young adults with no visual or motor impairments, so findings may not apply to populations with balance or perceptual deficits. The study focused on a single barrier type; it is unclear how these route selection principles apply to complex environments with multiple obstacles.
Declared interests
The authors declare no conflicts of interest.
The easy way to misread this
Do not assume these findings apply directly to clinical populations with gait or perceptual impairments. The study used healthy adults in a virtual reality setting, and the specific trade-off thresholds (1.65 degrees vs 0.75 meters) may differ in patients with motor or visual deficits.