Does the Size-Arrival Effect Occur With an Active Collision-Avoidance Task in an Immersive 3D Virtual Reality...

Area of Science:

• Human-Computer Interaction
• Visual Perception
• Traffic Safety

Background:

• The size-arrival effect (SAE) describes how larger objects approaching an observer appear to arrive sooner than smaller objects at the same speed.
• Previous SAE research used 2D displays and passive judgments, limiting real-world applicability.
• The SAE may contribute to vehicle collisions, particularly between motorcycles and cars.

Purpose of the Study:

• To investigate the occurrence of the size-arrival effect (SAE) in immersive, 3D virtual reality (VR) environments.
• To determine if active collision-avoidance responses influence the SAE.
• To assess the impact of different judgment tasks on SAE perception in VR.

Main Methods:

• Participants used a VR headset to view approaching objects.
• An active task involved participants ducking to avoid simulated objects.
• Passive tasks included predicting object arrival time (prediction-motion) and judging relative time-to-collision (TTC).

Main Results:

• The SAE was observed in passive prediction-motion and relative TTC judgment tasks within the VR environment.
• The SAE did not occur when participants actively ducked to avoid objects.
• Immersive 3D displays can elicit the SAE, but task demands significantly modulate its presence.

Conclusions:

• The size-arrival effect is present in immersive 3D virtual reality settings.
• Active collision-avoidance tasks mitigate the SAE, suggesting improved perception in dynamic, self-initiated responses.
• Findings highlight the importance of task context and display type in visual perception phenomena relevant to traffic safety.