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Updated: Aug 20, 2025

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Multiple object tracking with extended occlusions.

Jiří Lukavský1, Lauri Oksama2, Filip Děchtěrenko1

  • 1Institute of Psychology, Czech Academy of Sciences, Prague, Czech Republic.

Quarterly Journal of Experimental Psychology (2006)
|November 18, 2022
PubMed
Summary
This summary is machine-generated.

Tracking objects with limited views is challenging. Our study shows that longer occlusions increase errors, but remembering object identities can improve performance in difficult tracking scenarios.

Keywords:
Visual attentionmultiple identity trackingmultiple object trackingocclusionvisual memory

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Factors

Background:

  • Everyday viewing often involves limited apertures and occlusions, similar to observing objects on a screen or in traffic.
  • Previous multiple object tracking (MOT) studies have not extensively explored systematic, prolonged occlusions.
  • Understanding human performance under such constrained visual conditions is crucial for real-world applications.

Purpose of the Study:

  • To model and investigate human performance in multiple object tracking (MOT) with systematic occlusions.
  • To examine the impact of occlusion duration, frequency, and tracking workload on tracking accuracy.
  • To explore the role of object identity memory in mitigating performance decrements due to occlusions.

Main Methods:

  • Conducted three experiments involving MOT tasks with participants viewing objects through a covered area.
  • Manipulated occlusion width, tracking workload, and required participants to track object identities (multiple identity tracking [MIT]).
  • Analyzed item-level performance data to correlate errors with occlusion exposure and task demands.

Main Results:

  • Tracking is possible but difficult under systematic occlusions; longer and more frequent occlusions led to increased tracking errors.
  • Increased tracking workload exacerbated the negative effects of occlusions, but this effect was reduced under low workload.
  • Engaging in multiple identity tracking (MIT) improved performance in challenging occlusion conditions, contrary to expectations.

Conclusions:

  • Prolonged and partial occlusions significantly impair multiple object tracking (MOT) performance.
  • Cognitive strategies, such as actively remembering object identities, can enhance tracking accuracy even under severe visual constraints.
  • Findings highlight the importance of considering occlusion and workload in visual perception and attention research.