Power Law Based "Out of Body" Tactile Funneling for Mobile Haptics

Area of Science:

• Human-Computer Interaction
• Psychophysics
• Haptics

Background:

• Tactile illusions, specifically "out of body" experiences, can augment information displayed on mobile haptic devices by exploiting perceptual limitations.
• Understanding the psychophysical relationship between physical and perceived tactile stimuli is crucial for developing effective haptic feedback systems.

Purpose of the Study:

• To establish a psychophysics-based mathematical relationship between physical and phantom tactile stimulus intensity for "out of body" illusions.
• To evaluate existing algorithms and identify an ideal mathematical model for "out of body" tactile funneling.

Main Methods:

• Three experiments were conducted with 15 subjects to compare linear, logarithmic, and square algorithms for "out of body" tactile illusions.
• Physical stimuli were applied to index fingers, with phantom stimuli perceived mid-air between them.
• Psychophysical studies were used to derive a novel mathematical relationship.

Main Results:

• The "square algorithm" performed best among the tested existing algorithms for "out of body" tactile illusions.
• While superior to linear and logarithmic models, the "square algorithm" was not ideal for defining the tactile funneling illusion.
• A novel "power relationship" algorithm was established, demonstrating improved performance for "out of body" tactile funneling.

Conclusions:

• A "power relationship" effectively models the intensity of physical and phantom stimuli for "out of body" tactile illusions.
• The developed algorithm offers a better approach to creating "out of body" tactile feedback compared to existing methods.
• Future research should investigate the relationship between phantom stimulus location and physical stimulus intensity.