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Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Objects exhibit body model like shape distortions.

Aurelie Saulton1, Trevor J Dodds, Heinrich H Bülthoff

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The human body

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Area of Science:

  • Cognitive Neuroscience
  • Body Representation
  • Somatosensation

Background:

  • Accurate somatosensation is crucial for spatial body awareness.
  • Body models, internal representations of body metrics, are assessed via task distortions.
  • Comparing body and object perception reveals insights into the body model.

Purpose of the Study:

  • To investigate how body-centric reference frames influence shape perception.
  • To compare distortion patterns between the human hand and non-corporeal objects.
  • To determine if the localization task specifically measures hand-centric body model contributions.

Main Methods:

  • Participants estimated shapes of their hand and objects (rake, post-it pad, CD-box).
  • Shape estimates were compared between a localization task and a template matching task.
  • Distortion patterns (length vs. width) were analyzed across tasks and items.

Main Results:

  • Objects were perceived accurately in template matching but distorted in localization.
  • Distortions showed greater length underestimation than width underestimation for all items.
  • The hand exhibited significantly greater distortions in the localization task compared to objects.

Conclusions:

  • The magnitude of distortions in the localization task is specific to the human hand.
  • The localization task for the hand likely engages an implicit body model distinct from object localization.
  • Results support the idea that the hand's distortions involve both a unique body model and shared object-related factors.