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Spatiotemporal Thermal Control Effects on Thermal Grill Illusion.
Satoshi Saga1, Ryotaro Kimoto1, Kaede Kaguchi1
1Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan.
Sensors (Basel, Switzerland)
|January 8, 2023
Summary
Researchers developed a spatiotemporal control method for the thermal grill illusion, enhancing virtual pain experiences. Increasing temperature differences and thermal area intensify the virtual pain sensation and its perceived area.
Area of Science:
- Neuroscience
- Haptics
- Virtual Reality
Background:
- The thermal grill illusion creates pain using alternating warm and cool stimuli.
- Virtual reality aims to enhance immersion through realistic sensory feedback.
- Existing methods for virtual pain display are limited.
Purpose of the Study:
- To develop and evaluate a spatiotemporal control method for a variable thermal grill illusion.
- To enhance the realization of virtual pain display in virtual reality experiences.
- To investigate the influence of temperature distribution and thermal area on the illusion.
Main Methods:
- Investigated the effect of spatial temperature distribution (pre-warming and pre-cooling) on the onset of pain.
- Examined how the temperature difference between warm and cool stimuli affects pain perception.
- Assessed the impact of the number of thermal grids and total thermal area on pain area and magnitude.
Main Results:
- The period until pain onset shortened as the temperature difference between pre-warming and pre-cooling increased.
- A larger thermal area resulted in a larger perceived pain area.
- Increased thermal area also led to a greater magnitude of the pain sensation.
Conclusions:
- The developed spatiotemporal control method effectively modulates the thermal grill illusion.
- Temperature difference and thermal area are key factors in controlling virtual pain intensity and extent.
- This method offers a more universal approach to virtual pain display in VR.
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