The Influence of a Prop Mass on Task Performance in Virtual Reality

Sun, 01 Dec 2024 00:00:00 +0000

Study at a glance

This follow-up study examines a different question from training transfer: how does the mass of a physical prop affect immediate interaction in Virtual Reality? Participants completed a within-subject pointing task with three replicas of the same tool, each with a different mass.

The experimental task

The participant selected targets in VR using a tracked tool replica. The design captured both objective performance—error-free selection time and number of errors—and subjective experience, including perceived difficulty and cognitive load.

First-person view of the target-selection task used in the experiment.

Main result

Prop mass influenced both performance and experience. Participants performed significantly better with the light replica than with the heavy replica; they also reported lower difficulty and cognitive load. In contrast with the training study, this highlights that a mass mismatch can matter when the task places a premium on fast, accurate pointing.

Investigating Whether the Mass of a Tool Replica Influences Virtual Training Learning Outcomes

Mon, 01 Jan 2024 00:00:00 +0000

Why this matters

Instrumenting a real tool for Virtual Reality training often changes its mass. This study asks whether that physical mismatch compromises what matters most: the learner’s ability to perform the gesture afterwards in real conditions.

Study at a glance

Eighty participants completed a three-stage protocol: a real pre-training assessment, immersive training with a tracked replica, then a real post-training assessment. The experience covered three gestures with a one-handed rotary tool: cutting, drilling, and sanding.

The original tool weighed 624 g. The three replica conditions were balanced and weighted to 312 g (50%), 624 g (100%), and 936 g (150%). The study combined real-task performance measures with cognitive load, usability, and perceived-learning questionnaires.

Main result

Across the tested conditions, learning outcomes remained comparable despite the changes in replica mass. Participants also improved on selected real-task measures, including task-completion time. Within the 300–900 g range and for these tasks, replica mass was therefore not a decisive factor for the measured learning outcomes.

This result gives designers practical room to accommodate tracking and fabrication constraints—but it should not be overgeneralised to heavier tools, highly precise gestures, or tasks that require stronger proprioceptive or haptic feedback.

Physical props | Étienne Peillard

The Influence of a Prop Mass on Task Performance in Virtual Reality

Study at a glance

The experimental task

Main result

Investigating Whether the Mass of a Tool Replica Influences Virtual Training Learning Outcomes

Why this matters

Study at a glance

Main result