Electrotactile pulses can trick the human brain into feeling the specific chill of an open freezer without any actual change in temperature.
Thermal referral uses electric current instead of physical heat or cold to create phantom sensations in the body. Most haptic technology relies on clunky vibration motors that feel like toys. This method allows the brain to project a temperature sensation to a different part of the body than the one being touched. It creates a convincing illusion of non-contact cold, like standing near an ice block. This discovery could make virtual environments feel physically dangerous or refreshing without requiring massive amounts of energy.
Electrotactile Improves Thermal Referral
arXiv · 2605.00240
Thermal referral enables thermal sensations in locations lacking thermal actuators--this is achieved using vibrotactile actuators to redirect a nearby thermal sensation to where a tactile sensation is applied. However, we found that its reliance on vibration introduces critical limitations: it struggles to produce cold referral, and the inherent strong tactile "buzz" makes it unsuitable for simulating non-contact thermal events, such as the chill of an open freezer in VR (in contrast to contact-