Reshaping the peripersonal space in virtual reality.

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.