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Peripersonal space boundaries around the lower limbs.

K D Stone1, M Kandula2, A Keizer2

  • 1Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Heidelberglaan 1, 3584 CS, Utrecht, The Netherlands. k.d.stone@uu.nl.

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|November 4, 2017
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Summary

Researchers mapped peripersonal space (PPS), the sensory buffer around the body, for the lower limbs. They found tactile stimuli near the feet were processed faster when a visual stimulus approached, defining a new boundary for this multisensory integration zone.

Keywords:
Lower bodyPerceptionPeripersonal spaceVisuo-tactile integration

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Area of Science:

  • Neuroscience
  • Human Sensory Perception
  • Multisensory Integration

Background:

  • Bi- and tri-modal neurons in primates integrate tactile and near-body stimuli.
  • Peripersonal space (PPS) is a multisensory integration zone extending around the body.
  • Previous research primarily focused on upper body PPS, leaving lower limb PPS understudied.

Purpose of the Study:

  • To delineate the spatial boundary of peripersonal space (PPS) around the lower limbs in humans.
  • To investigate how visual stimuli approaching or receding from the feet influence tactile processing.
  • To understand multisensory integration mechanisms in the lower extremities.

Main Methods:

  • A multisensory interaction task involving tactile vibration on the toes and a visual stimulus.
  • Experiment 1: Visual stimulus approaching the feet; Experiment 2: Visual stimulus receding from the feet.
  • Measuring reaction times to tactile stimuli under different visual stimulus conditions.

Main Results:

  • Participants responded significantly faster to tactile stimuli when a visual stimulus approached within approximately 73 cm of the feet.
  • This facilitatory effect was observed only for approaching visual stimuli, not receding ones.
  • This study provides the first quantitative measure of PPS boundary for the lower limbs.

Conclusions:

  • The findings define a peripersonal space boundary around the lower limbs, approximately 73 cm.
  • Lower limb PPS shows sensitivity to approaching visual stimuli, suggesting a protective function.
  • This research contributes to understanding multisensory integration and spatial representation in the lower body.