The role of visual information on the perceptual system of heaviness and force generating system of lifting

本研究的目的是：(1)建立物体大小、颜色、纹理和形状等视觉信息可以被轻松、准确地操纵的虚拟现实环境，而物体重量、表面滑度、惯性张量、重心和质量分布等其他物理和触觉信息对人类感知和运动的影响比视觉信息更大；(2)研究视觉信息的作用。如物体的大小，特别是在本研究中，对重量的感知系统和力的产生系统的提升运动。关于第一个目的，在大阪大学研究生院多媒体工程系Yoshifumi Kitamura博士和西蒙弗雷泽大学运动学院Christine L. MacKenzie博士的合作下，Tezukayama大学行为神经科学实验室建立了名为“虚拟对象实验室系统”的虚拟环境，并增加了一些有用的设备。然而，由于超声波位置传感的分辨率较差，在实验操作中也遇到了一些困难，因此需要进行改进。在虚拟手实验系统下，采用尺寸-重量错觉范式（Charpentier 1891）研究了视觉尺寸对重量感知系统的影响。17名被试在虚拟手实验系统下比较了两个重量相同但视觉尺寸不同的增强立方体的重量差异。结果表明，视觉尺寸信息对感知系统有系统的影响。也就是说，随着物体尺寸的增加，被举起的物体被认为更轻。后续测试显示，错觉知觉的发生与被试区分体重的敏感性显著相关，而与区分视觉尺寸的敏感性无关。总之，由视觉尺寸线索引起的尺寸-重量错觉是基于感觉的，并且取决于个体基于多模态感觉信息的综合知觉。少

The purpose of this study was (1) to establish the virtual-reality environment in which visual information such as object size, color, texture, and shape were easily and accurately manipulated independent of other physical and haptic information such as object weight, surface slipperiness, inertia tensor, center of gravity, and mass distribution which affects human perception and movement more strongly than visual information, and (2) to investigate the roles of visual information, such as object size especially in this study, on the perceptual system of heaviness and force generating system of lifting movement. With regard to the first purpose, the virtual-environment called “Virtual Object Lab System" has been established at The Laboratory of Behavioral Neuroscience in Tezukayama University, in collaboration of Dr. Yoshifumi Kitamura, Department of Multimedia Engineering of Graduate School of Osaka University, and Dr. Christine L. MacKenzie, School of Kinesiology of Simon Fraser Univ … More ersity, with addition of some useful devices. However, some difficulties also have been found in operating for the experiment due to its poor resolution of position sensing by ultrasonic waves, thus the improvement has been required. Instead, with regard to the second purpose, effects of visual size on perceiving system of heaviness were investigated using the size-weight illusion paradigm (Charpentier 1891) under the Virtual Hand Lab System. 17 subjects compared difference in heaviness of two augmented cubes with identical weight but different visual sizes under the Virtual Hand Lab System. Results indicated that visual size information was systematically affected perceived system. That is, the lifted object was perceived to be lighter as object size cues increased. Follow-up tests showed occurrence of the illusive perception was significantly correlated with subject's sensitivity to discriminate WEIGHT, but not with sensitivity to discriminate VISUAL SIZE. Conclusively, the size-weight illusion induced by visual size cues is sensory based, and depends on an individual's integrated perception based on multimodal sensory information. Less