Perceived displacement explains wolfpack effect.

Area of Science:

• Human-Computer Interaction
• Cognitive Psychology
• Perception Science

Background:

• Agent-like stimuli influence dynamic interactive task performance.
• Previous studies suggested agent orientation is a key cue (wolfpack effect).
• Perceived displacement of agent bodies is larger than predicted by center of mass.

Purpose of the Study:

• Investigate perceived displacement of moving agents in dynamic tasks.
• Clarify the role of agent orientation and pivot point in motion perception.
• Determine if orientation is a necessary cue beyond body center perception.

Main Methods:

• Utilized multiple dynamic interactive tasks with varying demands.
• Measured perceived displacement using explicit and implicit judgment tasks.
• Manipulated the agent's pivot point location to test its effect on perception and behavior.

Main Results:

• Perceived agent body center is displaced in the agent's facing direction.
• Explicit and implicit measures of displacement are dissociated.
• Avoidance behavior (wolfpack effect) disappeared when the pivot point matched the perceived body center.

Conclusions:

• Agent orientation is not an independent cue; perceived displacement is key.
• Observed avoidance behavior resulted from a misaligned pivot point confounding rotation and translation.
• Perception of the agent's body center is critical for accurate dynamic interaction.