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Abstract:
This article systematically explores cue integration within active touch. Our research builds upon a recently made distinction between position and force cues for haptic shape perception: When sliding a finger across a bumpy surface, the finger follows the surface geometry (position cue). At the same time the finger is exposed to forces related to the slope of the surface (force cue). Experiment 1 independently varied force and position cues to the curvature of 3D-arches. Perceived curvature could be well described as a weighted average of the two cues. Experiment 2 found more weight of the position cue for more convex high arches and higher weight of the force cue for less convex shallow arches probably mediated through a change in relative cue reliability. Both findings are in good agreement with the Maximum-Likelihood-Estimation (MLE) model for cue integration and, thus, carrying this model over to the domain of active haptic perception.
