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Related Experiment Videos

Amodal representation depends on the object seen before partial occlusion.

J S Joseph1, K Nakayama

  • 1Department of Psychology, Harvard University, Cambridge, MA 02138, USA. jsj@unr.edu

Vision Research
|May 18, 1999
PubMed
Summary
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Past object visibility influences how we perceive occluded objects. Prior experience with fully visible objects affects their amodal representation after partial occlusion, impacting motion perception.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • Object perception relies on integrating visible and hidden parts.
  • Amodal completion explains how we perceive complete objects despite occlusion.

Purpose of the Study:

  • To investigate history-dependent effects on amodal object representation.
  • To determine if prior visibility of an object influences its perception after occlusion.

Main Methods:

  • Ambiguous apparent motion correspondence used to assess amodal continuation.
  • Partially occluded bars of varying lengths presented with a moving occluder.
  • Variable delay periods between occlusion and motion stimulus presentation.

Main Results:

Related Experiment Videos

  • Subjects showed a bias favoring motion consistent with the bar's original orientation after a 1-s delay.
  • Longer bars exhibited greater amodal continuation.
  • A control experiment ruled out 2D effects, confirming amodal representation influence.
  • A history effect was observed in 4/6 subjects after a 2-s delay.

Conclusions:

  • The amodal representation of an object is influenced by its prior visible state.
  • Visual history plays a specific role in amodal completion and object perception.
  • Individual differences exist in the duration of these history-dependent effects.