Representing Egocentric Directions with Torso-Applied Vibrotactile Stimuli

Area of Science:

• Human-Computer Interaction
• Sensory Perception
• Haptics

Background:

• Torso-based vibrotactile displays are emerging for enhanced user experiences.
• Understanding egocentric directional perception is crucial for effective haptic feedback design.
• Current research lacks comprehensive analysis of azimuth and elevation perception using combined real and illusory vibrotactile stimuli.

Purpose of the Study:

• To investigate egocentric directional perception (azimuth and elevation) using torso-based vibrotactile stimuli.
• To compare the effectiveness of real versus illusory vibrotactile stimuli in conveying directional information.
• To analyze biases and independence of azimuth and elevation perception on the torso.

Main Methods:

• Conducted four perceptual experiments on stimulus identification and direction association.
• Utilized real vibrotactile stimuli and illusory stimuli generated by the funneling illusion.
• Collected data on azimuth and elevation perception across various torso locations.

Main Results:

• Illusory stimuli enhanced directional information transmission with fewer tactors compared to real stimuli alone.
• Observed a lateral bias in azimuth perception and a downward bias in elevation perception on the dorsal torso.
• Azimuth and elevation perceptual errors showed weak correlation, indicating near-independent processing.
• Azimuth cues were found to be more effective than elevation cues for conveying directional information.

Conclusions:

• Egocentric directional perception on the torso can be effectively modulated by vibrotactile stimuli, including illusory ones.
• The findings provide practical insights for designing more intuitive and effective torso-based vibrotactile feedback systems.
• Azimuth and elevation perception are largely independent, with azimuth being a more salient cue.