Wijntjes Maarten W A, Volcic Robert, Pont Sylvia C, Koenderink Jan J, Kappers Astrid M L
Faculty of Industrial Design Engineering, Delft University of Technology, Delft, The Netherlands.
Exp Brain Res. 2009 Mar;193(4):639-44. doi: 10.1007/s00221-009-1713-9. Epub 2009 Feb 8.
We studied the influence of haptics on visual perception of three-dimensional shape. Observers were shown pictures of an oblate spheroid in two different orientations. A gauge-figure task was used to measure their perception of the global shape. In the first two sessions only vision was used. The results showed that observers made large errors and interpreted the oblate spheroid as a sphere. They also misinterpreted the rotated oblate spheroid for a prolate spheroid. In two subsequent sessions observers were allowed to touch the stimulus while performing the task. The visual input remained unchanged: the observers were looking at the picture and could not see their hands. The results revealed that observers perceived a shape that was different from the vision-only sessions and closer to the veridical shape. Whereas, in general, vision is subject to ambiguities that arise from interpreting the retinal projection, our study shows that haptic input helps to disambiguate and reinterpret the visual input more veridically.
我们研究了触觉对三维形状视觉感知的影响。向观察者展示了处于两种不同方向的扁球体图片。采用规范图形任务来测量他们对整体形状的感知。在前两个阶段仅使用视觉。结果表明，观察者出现了很大的误差，将扁球体误判为球体。他们还将旋转后的扁球体误判为长球体。在随后的两个阶段，观察者在执行任务时被允许触摸刺激物。视觉输入保持不变：观察者看着图片，看不到自己的手。结果显示，观察者感知到的形状与仅使用视觉的阶段不同，且更接近真实形状。一般而言，视觉会因对视网膜投影的解读而产生模糊性，但我们的研究表明，触觉输入有助于更准确地消除视觉输入的模糊性并重新解读它。
