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Abstract

The compliance of a material can be conveyed through mechanical interactions in a virtual environment and perceived
through both visual and haptic cues.We investigated this basic aspect of perception. In two experiments subjects performed compliance
discriminations, and the mean perceptual estimate (PSE) and and the perceptual standard deviation (proportional to JND) were derived
from psychophysical functions. Experiment 1 supported a model in which each modality acted independently to produce a compliance
estimate, and the two estimates were then integrated to produce an overall value. Experiment 2 tested three mathematical models of
the integration process. The data ruled out exclusive reliance on the more reliable modality and stochastic selection of one modality.
Instead the results supported an integration process that constitutes a weighted summation of two random variables, which are defined
by the single modality estimates. The model subsumes optimal fusion but provided valid predictions also if the weights were not optimal.
Weights were optimal (i.e., minimized variance) when vision and haptic inputs were congruent, but not when they were incongruent.