Tactile force perception depends on the visual speed of the collision object

Area of Science:

• Neuroscience
• Human Sensory Perception
• Multimodal Interaction

Background:

• Previous research on vision-touch interaction identified averaging and contrast effects using static visual and continuous tactile stimuli.
• The contrast effect, notably in the size-weight illusion, has been historically linked to specific sensory pairings.
• Existing models often do not fully account for dynamic visual motion's influence on tactile perception.

Purpose of the Study:

• To investigate a novel visuotactile interaction using visual motion information.
• To determine if visual motion, specifically of a virtual collision, can modulate the magnitude of tactile force perception (MTFP).
• To explore the contrast effect in the context of dynamic visual stimuli and tactile impact.

Main Methods:

• Developed a collision simulator to present visual stimuli independently from tactile stimuli.
• Applied impact stimuli to the palm to measure the magnitude of tactile force perception (MTFP).
• Manipulated visual motion information (pre- and post-collision speeds) during virtual collision events.

Main Results:

• Visual motion information significantly modified the magnitude of tactile force perception (MTFP) during virtual collisions.
• Increased visual speeds (both pre- and post-collision) led to a decreased perception of tactile force, even when actual contact force was constant.
• This effect aligns with the principles of the contrast effect, demonstrating its applicability beyond static stimuli.

Conclusions:

• Visual motion information plays a crucial role in modulating tactile force perception.
• A novel contrast effect driven by visual motion was identified in visuotactile interaction.
• Proposed a quantitative model where MTFP is a function of visual velocity difference, suggesting altered gain in tactile perception processing.