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Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Finger posture modulates structural body representations.

Luigi Tamè1, Elanah Dransfield1, Thomas Quettier1

  • 1Department of Psychological Sciences, Birkbeck, University of London, London, United Kingdom.

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Summary
This summary is machine-generated.

Structural body representations (BSRs) are not fixed and change based on real-time hand posture. This research shows finger agnosia assessments are influenced by finger splay, impacting BSRs.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Perception

Background:

  • Lesions in the left posterior parietal cortex cause finger agnosia, a deficit in finger identification.
  • Dissociations between finger agnosia and intact sensation/action suggest distinct body representations (structural vs. sensorimotor).

Purpose of the Study:

  • To investigate if hand posture modulates performance on finger agnosia assessment tasks.
  • To determine if structural body representations (BSRs) are static or dynamic.

Main Methods:

  • Utilized the 'in between' test and a finger localization task.
  • Manipulated hand posture by varying finger splay (distance between fingers).
  • Analyzed judged finger numerosity based on direct report and actual finger counts.

Main Results:

  • Judgments of finger numerosity increased significantly when non-adjacent fingers were splayed farther apart.
  • Judgments remained unchanged when adjacent fingers were stimulated.
  • Demonstrated that BSRs are dynamically modulated by the physical distances between body parts.

Conclusions:

  • Structural body representations are not fixed but are adaptable and influenced by real-time physical configurations of the body.
  • Hand posture and finger splay dynamically alter how individuals perceive and represent their own fingers.