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Related Experiment Video

Updated: May 2, 2026

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Rightward shift of self-face representation.

Kazuyoshi Chikamura1, Wakaba Yoshida1, Shuma Tsurumi1

  • 1Hokkaido University, Japan.

I-Perception
|May 1, 2026
PubMed
Summary
This summary is machine-generated.

Self-face representation shows a rightward bias when using the right finger, but a leftward bias when using the left finger. This suggests biases in facial representation are influenced by the reporting hand.

Keywords:
body representationface representationproprioceptive pointingrightward mislocalizationrightward shiftself-face representation

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human perception

Background:

  • Self-face representation is an internal facial image, not always matching physical appearance.
  • Previous research indicated a rightward shift for central/right facial features.
  • This rightward bias might stem from using the right index finger for reporting.

Purpose of the Study:

  • To investigate if the reporting finger influences self-face representation biases.
  • To determine if a leftward bias occurs when using the left index finger.
  • To differentiate general representational biases from finger-specific artifacts.

Main Methods:

  • Participants (n=28) pointed to facial features on a transparent board with eyes closed.
  • Used either the right or left index finger for pointing.
  • Recorded and digitally analyzed reported feature locations against actual positions.

Main Results:

  • A rightward bias was observed for central and right-side features when using the right finger.
  • A leftward bias emerged for left-side features when using the left finger.
  • Right-side features still showed a rightward bias even when the left finger was used.

Conclusions:

  • Facial feature representation biases are influenced by the reporting finger's side.
  • A general rightward shifting tendency exists in self-face representation.
  • The reporting finger introduces an artifactual bias, particularly for features on the same side as the finger.