Thermal feedback device speeds up feeling hot and cold on fingertips
TherMosaic: Accelerating Perceived Thermal Transitions Through Spatiotemporal Thermal Feedback
Human-Computer Interaction
Summary
Feeling changes in temperature quickly during interactive experiences is hard because devices that heat or cool usually do so slowly. The authors developed a new way called TherMosaic that uses a small grid of temperature controllers on the fingertip to trick the brain into sensing temperature changes faster. They found that spreading out the heat and cool signals and using the body's own adjustment to temperature helped speed up how quickly people felt these changes. Their design made thermal sensations in virtual reality feel more natural and better timed with what users see.
thermal feedbackthermoelectric devicesPeltier modulesspatial summationthermal adaptationperceived temperaturevirtual realityhaptic feedbacktemperature transitioninteractive technology
Authors
Zining Zhang, Jiasheng Li, Myungin Lee, Zeyu Yan, Jin Ryong Kim, Huaishu Peng
Abstract
Thermal feedback can enrich immersive interaction, but thermoelectric devices often change temperature too slowly to match interactive timing. We present TherMosaic, a spatiotemporal thermal feedback approach that accelerates perceived temperature transitions by leveraging two perceptual mechanisms: spatial summation and thermal adaptation. Focusing on the fingertip, we first investigate this approach using a custom 2*2 array of independently controlled Peltier modules. Across three controlled perceptual studies, we show that distributed thermal stimulation can preserve stable hot and cold percepts despite local deviations, that adaptation helps maintain these percepts during changing stimulation, and that combining these effects reduces perceived transition time by about 30%-40% for transitions originating from hot or cold states. We then translate the same design principles into a standalone wearable implementation of TherMosaic and evaluate it in virtual reality. Our results show that this approach reduces perceived thermal lag and improves temporal alignment between thermal and visual events in interactive use.