Haptic Representation Method for Material Properties utilizing Pseudo-weight Shifting

Force cues contribute significantly to the perception of material properties. Building on this principle, we propose a novel method that represents material properties utilizing pseudo-attraction force. Our method generates this perceived force in response to user motion, with a compact interface that produces asymmetric vibrations. This force sensation induces a perceived weight shift (Pseudo-weight shift), creating the perception of internal dynamics to convey the physical presence of a virtual object. System evaluations confirmed that the method produces a sensation equivalent to the inertial force of a 17.7 g mass. Furthermore, a large-scale user study and psychophysical experiment revealed that our method enables parametric control of perceived material properties, particularly viscosity, by modulating the vibration profile. This approach demonstrates that perceived force effectively substitutes for physical force, enabling vivid material representation through a compact interface and simple design. This expands the design space for expressive handheld haptics.