Department of Psychology, University of Western Ontario, London, ON, N6A 5C2, Canada.
Exp Brain Res. 2010 Apr;201(4):863-73. doi: 10.1007/s00221-009-2101-1. Epub 2009 Dec 1.
We investigated the contribution of haptic and visual information about object size to both perception and action. Kinematics of the right hand were measured while participants performed grasping actions or manual estimations under the guidance of haptic information from the left hand, binocular visual information, or both haptics and vision. The greatest uncertainty was observed with haptic information alone. Moreover, when visual and haptic sizes were congruent, performance was no different from that with vision alone. Although this gives the appearance that vision dominates, when information from the two senses was incongruent, an influence of haptic cues emerged for both tasks. Our paradigm also allowed us to demonstrate that haptic sensitivity, like visual sensitivity, scales with object size for manual estimation (consistent with Weber's law) but not for grasping. In sum, although haptics represents a less certain source of information, haptic processing follows similar principles to vision and its contribution to perception and action becomes evident only when cross-modal information is incongruent.
我们研究了触觉和视觉信息对物体大小的感知和动作的贡献。在左手提供触觉信息、双眼视觉信息或两者同时提供的指导下，测量了右手的运动学，参与者执行抓握动作或手动估计。仅使用触觉信息时观察到最大的不确定性。此外，当视觉和触觉尺寸相同时，表现与仅使用视觉时没有区别。尽管这表明视觉占主导地位，但当两种感觉的信息不一致时，两种任务都会出现触觉线索的影响。我们的范式还使我们能够证明，与视觉灵敏度一样，触觉灵敏度在手动估计中（符合韦伯定律）随物体大小而变化，但在抓握时则不然。总之，尽管触觉提供的信息不太确定，但触觉处理遵循与视觉相似的原则，只有当跨模态信息不一致时，它对感知和动作的贡献才会显现出来。
