At QoMEX 2015, ‘theory and applications of measuring the quality of user experiences, based on both objective and subjective psychophysiological measures’ will be discussed. The workshop will host experts from academia and industry. It will feature presentations, lectures, poster and plenary sessions, and Special Sessions.

Effects of Visual Latency on Visual-Haptic Experience of Stiffness

By Bing Wu, Sung Hun Sim, Andinet Enquobahrie, and Ricardo Ortiz

This paper will be presented by Andinet Enquobahrie.


In multimodal virtual-reality, augmented-reality, and tele-operation systems, a temporal asynchrony often exists between visual and haptic feedback due to differences in processing and rendering the two types of signals. We have conducted two psychophysical experiments to examine how such asynchrony influences our perceptual experience with an object’s stiffness. The subjects explored a virtual elastic material using a haptic interface, and saw the deformation of the material in a simulated ultrasound that was displayed with a constant or variable latency relative to the haptic feedback. Their perception of stiffness and ability to differentiate stiffness were measured. The results showed that the perceived stiffness increased with the visual latency while the differentiation threshold was little influenced. When the visual latency was variable, the effects were reduced and subjects relied more on the haptic sensations. Such effects will be further evaluated in clinical settings using a neural surgical simulator.

Physical Event