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How do humans group non-rigid objects in multiple object tracking?: Evidence from grouping by self-rotation.

Luming Hu1, Chen Zhao1, Liuqing Wei2

  • 1Beijing Key Laboratory of Applied Experimental Psychology, Faculty of Psychology, National Demonstration Center for Experimental Psychology Education, Beijing Normal University, Beijing, China.

British Journal of Psychology (London, England : 1953)
|December 18, 2021
PubMed
Summary
This summary is machine-generated.

People can use object self-rotation information to group non-rigid objects, even when it hinders tracking. This finding reveals self-motion as a new grouping feature in dynamic scenes.

Keywords:
additivitycommon fategroupingmultiple object trackingnon-rigidself-rotation

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Motion Perception

Background:

  • Previous research on perceptual grouping focused on spatiotemporal and featural cues for rigid objects.
  • The role of self-motion, particularly self-rotation, in grouping spatially separated objects remains under-explored.
  • Naturalistic object motion involves simultaneous translation and rotation, complicating rigidity and potentially affecting perceptual grouping.

Purpose of the Study:

  • To investigate the specific role of self-rotation information in the perceptual grouping of spatially separated, non-rigid objects.
  • To determine if self-rotation is used strategically or automatically for grouping.
  • To differentiate grouping based on self-rotation from other cues like surface-level motion or shape changes.

Main Methods:

  • A modified multiple object tracking (MOT) paradigm was employed using self-rotating objects.
  • Experiments systematically varied object properties and motion cues to isolate the effect of self-rotation.
  • Behavioral data were analyzed to assess grouping performance and strategic use of self-rotation information.

Main Results:

  • Participants successfully used self-rotation information to group non-rigid objects, despite it being detrimental to attentive tracking.
  • The grouping advantage was attributed to self-rotation itself, not surface-level cues like 2D motion or shape.
  • Grouping by self-rotation was comparable to grouping by changing shape but additive, suggesting distinct information sources.

Conclusions:

  • Self-motion, specifically self-rotation, serves as a novel feature for perceptual grouping of dynamic objects.
  • Object grouping in dynamic scenes can leverage distinct information sources, including motion flow fields and deformation.
  • This study advances our understanding of how the visual system forms object units during motion perception.