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Whole-body immobilization modulates visuotactile interaction.

Naoki Kuroda1,2,3, Ryo Teraoka4, Shinya Harada5

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Whole-body immobilization, not just box embodiment, enhances visuotactile interaction in peripersonal space (PPS). This study investigated trunk-centered PPS effects during body fixation, revealing immobilization

Keywords:
Body immobilizationPeripersonal spaceVirtual realityVisuotactile interaction

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Area of Science:

  • Neuroscience
  • Perception
  • Human Body Interaction

Background:

  • Peripersonal space (PPS) is the immediate space surrounding the body.
  • Previous research showed hand immobilization shrinks hand-centered PPS.
  • The impact of whole-body immobilization on other body parts' PPS remains largely unknown.

Purpose of the Study:

  • To investigate the effect of whole-body immobilization on trunk-centered peripersonal space.
  • To differentiate the effects of body immobilization from box embodiment on PPS.
  • To examine visuotactile interactions within the trunk-centered PPS.

Main Methods:

  • Two experiments were conducted using a tactile stimulus on the chest and an approaching visual probe.
  • Experiment 1 compared trunk-centered PPS with and without a large box.
  • Experiment 2 manipulated box size (large vs. small) to assess box embodiment effects.
  • Visual facilitation of tactile detection and perceived body immobilization were measured.

Main Results:

  • Visual facilitation of tactile detection was greater when the body was within a box compared to without.
  • A smaller box led to greater visual facilitation than a larger box.
  • Perceived body immobilization was stronger in the with-box condition and with a smaller box.

Conclusions:

  • Body immobilization significantly enhances visuotactile interactions within the trunk-centered peripersonal space.
  • The degree of body immobilization, rather than the mere presence or size of a confining box, appears to be the primary driver of enhanced visuotactile interaction.
  • These findings contribute to understanding how physical constraints shape our perception of space around the body.