Body orientation suggests the next direction of travel
Aliases: body heading · chassis orientation · heading cue
What it is
A body orientation cue is the use of a robot's chassis or main body's facing direction to predict subsequent travel. For platforms with a visible front, orientation becomes a heading prior. People may keep that assumption even when a holonomic base can move sideways.
Why it happens
Animals and vehicles usually travel along their front axis, and observers transfer that regularity to robots. Orientation receives more weight when other evidence is sparse, then combines with wheel motion, velocity, and path. Holonomic translation, in-place rotation, and independently moving sensors break the front–motion coupling, making feasible sideways movement appear abrupt.
Studying it
Body facing and actual travel can be crossed while measuring early direction prediction, response time, avoidance side, and surprise across differential, Ackermann, and holonomic bases. Path and speed must remain matched. First exposure and learned performance should be separated because users may acquire platform-specific kinematics.
Where it stops holding
A circular body without a front cannot support the cue reliably, and a manipulator base does not predict end-effector direction. Experts can adapt to lateral motion, but public bystanders lack training. Orientation expresses a tendency, not braking state or a guaranteed route.
Applying it
- Align the visual front with common travel; before lateral motion, establish a new heading through rotation, a light band, or projection.
- Remove competing “fronts” created by shell, sensors, and display.
- During instruction-free first encounters, ask for next-direction and avoidance predictions; measure errors under orientation–motion conflict and trials required to learn.