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Virtual Reality Conference, IEEE (2001)
Yokohama, Japan
Mar. 13, 2001 to Mar. 17, 2001
ISSN: 1087-8270
ISBN: 0-7695-0948-7
pp: 115
Anatole Lécuyer , EADS CCR
Jean-Marie Burkhardt , INRIA, Universit? Paris V
Philippe Coiffet , CNRS, LRP
This paper describes a psychophysical experiment designed to study the phenomenon of illusion which occurs with the pseudo-haptic feedback (see [13]), and to identify the moment when this illusion occurs: the "boundary of illusion." The subjects were given the task of deciding which of two virtual springs is the stiffer,these springs being simulated with a PHANToM force feedback device and displayed on a monoscopic computer screen. The first spring has a realistic behavior since its visual and haptic displacements are identical.The second spring-the pseudo-haptic one-is stiffer,on a haptic basis,but sometimes less stiff,on a visual basis. The data collected allowed us to calculate the visual Point of Subjective Equality (PSE) between the two springs, which represents the boundary of the sensory illusion.On average,a high value of PSE turned out to be -24%.This value increases monotonically when the haptic difference between the springs increases.This implies that more visual deformation is necessary to compensate large haptic differences and qualifies the notion of visual dominance. However,this boundary varies greatly depending on the subjects and their strategy of sensory integration.The subjects were sensitive to this illusion to varying degrees. They were divided into different populations from those who were "haptically oriented" those who were "visually oriented."

A. Lécuyer, P. Coiffet, J. Burkhardt and S. Coquillart, ""Boundary of Illusion:" An Experiment of Sensory Integration with a Pseudo-Haptic System," Virtual Reality Conference, IEEE(VR), Yokohama, Japan, 2001, pp. 115.
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