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Disentangling the External Reference Frames Relevant to Tactile Localization.

Tobias Heed1, Jenny Backhaus1,2, Brigitte Röder1

  • 1Biological Psychology and Neuropsychology, Faculty of Psychology and Human Movement Science, University of Hamburg, Hamburg, Germany.

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Summary
This summary is machine-generated.

Tactile spatial coding relies on multiple reference frames. Hand crossing effects on temporal order judgments are reduced when hands align with gaze, suggesting gaze-centered coding is key for touch perception.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • Tactile spatial coding involves complex reference frames.
  • Hand crossing impairs temporal order judgments (TOJ) due to conflicting spatial codes.
  • Previous research suggests gaze-centered coding for tactile localization.

Purpose of the Study:

  • To investigate the role of gaze-centered and trunk-centered reference frames in tactile spatial coding.
  • To determine if gaze-centered coding alone explains hand-crossing effects in TOJ tasks.
  • To explore the integration of multiple reference frames in tactile perception.

Main Methods:

  • Participants performed TOJ tasks with manipulated hand positions relative to gaze and trunk.
  • Experimental postures aimed to reduce conflict between anatomical and external spatial codes.
  • Analysis focused on accuracy and reaction time in TOJ performance.

Main Results:

  • TOJ crossing effects were significantly reduced when hands were on the same side relative to gaze.
  • This indicates a dominant role for gaze-centered coding in tactile spatial awareness.
  • Evidence for trunk-centered coding was weak, affecting reaction time but not accuracy.

Conclusions:

  • Gaze-centered coding is crucial for tactile perception, particularly in TOJ tasks.
  • Trunk-centered coding plays a minor role, and other frames (e.g., limb-centered) are likely involved.
  • Tactile localization integrates information from multiple anatomical and external reference frames.