Heat pain modulation with virtual water during a virtual hand illusion

Area of Science:

• Neuroscience
• Psychology
• Human-Computer Interaction

Background:

• Immersive virtual reality (VR) offers novel ways to manipulate sensory experiences.
• Top-down modulation of pain involves cognitive and contextual influences on pain perception.

Purpose of the Study:

• To investigate the influence of virtual environmental context on pain perception using an embodied virtual hand illusion.
• To examine how temperature illusions and sense of agency in VR affect pain modulation.

Main Methods:

• Participants experienced painful heat stimuli while interacting with a virtual hand under a virtual tap dispensing 'virtual water'.
• Temperature illusions were induced using colored lights (red/warm, blue/cold, white/control).
• Sense of agency was manipulated by varying control over the virtual hand's movement.

Main Results:

• Participants associated blue light with cold and red light with warm sensations.
• Cold virtual water (blue light) significantly reduced pain intensity and unpleasantness.
• Warm virtual water (red light) significantly increased pain intensity and unpleasantness compared to control.
• Sense of agency manipulation affected agency but not pain ratings.

Conclusions:

• Contextual manipulations within immersive VR, specifically temperature illusions, can significantly modulate pain perception.
• These findings highlight the potential of embodied VR experiences for pain therapy.
• The study underscores the importance of considering contextual effects in VR-based pain management strategies.