The rubber hand illusion induced by visual-thermal stimulation

Area of Science:

• Neuroscience
• Psychology
• Sensory Integration

Background:

• The rubber hand illusion (RHI) typically uses synchronous visual-tactile input to create a sense of body ownership.
• Previous research has primarily focused on visual-tactile integration for inducing the RHI.

Purpose of the Study:

• To investigate if the RHI can be induced using visual-thermal stimuli.
• To determine how temperature-color congruency in visual stimuli affects RHI vividness.

Main Methods:

• A within-subject design was employed.
• Participants received synchronous or asynchronous visual stimuli (red/blue light) paired with thermal stimuli (warm/cold) applied to their hidden hand.
• RHI vividness and temperature ratings were collected.

Main Results:

• Visual-thermal stimuli successfully induced the RHI, with vividness comparable to visual-tactile methods.
• Synchronous, congruent stimulus patterns (warm-red, cold-blue) resulted in higher RHI vividness than incongruent patterns.
• Temperature ratings were influenced by actual temperature and synchrony, with a slight effect of color.

Conclusions:

• The RHI can be effectively induced using visual-thermal sensory information.
• Congruency between visual color and thermal temperature significantly modulates RHI vividness.
• Findings open new avenues for research into multisensory integration and body representation.