The effect of exploration mode on visuo-haptic slant perception M Plaisier, L C van Dam, C Glowania, M Ernst |
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Cognitive Neurosciences, Bielefeld University, Germany
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| Visual and haptic information can be integrated in a statistically optimal fashion, however, for slant perception reports exist of suboptimal integration [Rosas et al, 2005, J. Opt. Soc. Am. A, 22(5), 801-809]. It was hypothesised that this may be related to the exploration mode, which was not equal. Therefore we investigate the role of exploration mode in visuo-haptic slant integration Participants looked onto a 3D rendered surface through shutter glasses, while haptic information was displayed using two PHANToM force-feedback devices. In the "serial" condition participants moved the index finger to explore the surface. Visually, the surface was visible through a small circular aperture around the finger. In the "parallel" condition, participants placed the index and middle finger simultaneously on the surface and held them stationary. In this case a circular aperture was displayed around each finger. The visual slant percept was more precise in the parallel condition, whereas haptic slant was more precise in the serial condition. In contrast to the Rosas et al. study, the exploration for both modalities was the same within conditions. Our results suggest that as long as the exploration mode is the same for both modalities, there is statistically optimal integration regardless of exploration mode. |
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