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Peripersonal space (PPS) size expands with tool use, but only when pulling objects. This study shows that the specific tool and motor routine are crucial for reshaping PPS, impacting our sense of personal space.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human-Computer Interaction

Background:

  • Peripersonal space (PPS) is the egocentric space within reach.
  • Tool use is known to dynamically alter PPS boundaries.
  • The influence of specific tool types and motor actions on PPS reshaping remains unclear.

Purpose of the Study:

  • To investigate if PPS reshaping is dependent on the type of tool used.
  • To determine if the motor routine associated with tool use influences PPS changes.
  • To explore the role of interaction dynamics in PPS modulation within a virtual reality environment.

Main Methods:

  • Utilized an immersive virtual reality (VR) environment for a visuo-tactile detection task.
  • Measured PPS size before and after participants engaged in tool-use training.
  • Compared PPS changes resulting from 'pulling/pushing' with a shovel versus 'hammering/shooting' actions.

Main Results:

  • Pull training significantly enlarged PPS, consistent with previous real-world findings.
  • No significant PPS size changes were observed with other tools or motor routines (pushing, hammering, shooting).
  • Virtual reality effectively replicated and extended real-world observations of PPS plasticity.

Conclusions:

  • PPS reshaping is a complex process influenced by the interplay between the agent, targets, and motor routines.
  • The specific interaction, particularly pulling actions, plays a critical role in expanding the peripersonal space.
  • Findings highlight the importance of considering interaction specifics when studying PPS modulation, especially in virtual environments.