Lobo Lorena, Travieso David
Universidad Autónoma de Madrid, Madrid, Spain.
Psicothema. 2012 Feb;24(1):55-61.
One of the most surprising capacities of the haptic system is the ability to estimate different properties of objects, like weight or length, through invariants of rotational mechanics that are accessible via the proprioceptive system. This field of research is called Dynamic Touch. In its classical experimental paradigm, the participant firmly grasps a rod that can be wielded but not seen, and he or she tries to match the hand-held rod's length using another rod that can be seen but not wielded. In the experiment reported here, we focus on the role of the exploratory behavior, restricting the wielding in six conditions that vary both the amplitude and the frequency of movements. Increments in the speed of the movement are shown to increase the accuracy in the haptic estimation. It is argued that these results support the moment of inertia as the best informational candidate, given that it is an invariant property that only emerges when rotational torques are applied. Alternative candidates such as static moment or mass are discarded because they do not depend on differential movements.
触觉系统最令人惊讶的能力之一是能够通过本体感觉系统可获取的旋转力学不变量来估计物体的不同属性，如重量或长度。这个研究领域被称为动态触觉。在其经典实验范式中，参与者紧紧握住一根可以挥舞但看不见的杆，然后试图用另一根可以看见但不能挥舞的杆来匹配手持杆的长度。在本文报道的实验中，我们关注探索行为的作用，在六种不同运动幅度和频率的条件下限制挥舞动作。结果表明，运动速度的增加会提高触觉估计的准确性。有人认为，这些结果支持转动惯量作为最佳信息候选者，因为它是一种只有在施加旋转扭矩时才会出现的不变属性。诸如静矩或质量等替代候选者被排除，因为它们不依赖于差异运动。
