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A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras
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Hidden size: Size representations in implicitly coded objects.

Elif Memis1, Gizem Y Yildiz1, Gereon R Fink2

  • 1Institute of Neuroscience and Medicine (INM-3), Forschungszentrum Jülich GmbH, Jülich, Germany.

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Summary
This summary is machine-generated.

Perceived object size is influenced by context, not just retinal image size. This study shows that contextual size rescaling occurs early in visual processing, even for unrecognizable objects.

Keywords:
Context integrationEbbinghaus illusionObject-substitution masking (OSM)Rescaled size perception in masked objectsSize averagingSize illusion

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Psychophysics

Background:

  • Object size perception is complex, influenced by retinal angular size and contextual information.
  • The Ebbinghaus illusion demonstrates how surrounding elements can alter perceived object size.
  • Object-Substitution Masking (OSM) provides a method to investigate early visual processing stages.

Purpose of the Study:

  • To determine at which processing level contextual size interpretation occurs.
  • To investigate if masked objects are already size-rescaled.
  • To examine the contribution of masked and non-masked stimuli to perceived average size.

Main Methods:

  • Utilized a modified Ebbinghaus illusion to induce size rescaling.
  • Employed Object-Substitution Masking (OSM) with dot inducers.
  • Used a size-averaging paradigm to assess perceived average size of central target circles.

Main Results:

  • The modified Ebbinghaus illusion successfully altered perceived stimulus size and demonstrated robust OSM.
  • The size-averaging paradigm detected perceived size changes induced by the illusion.
  • Both masked and non-masked stimuli contributed to size averaging in a size-rescaled manner.

Conclusions:

  • Context integration, as shown by the Ebbinghaus illusion, affects size representations at an early visual processing stage.
  • Size rescaling occurs regardless of whether the target object is recognizable.
  • Perceived average size is coded relative to surrounding perceptual groups.