Mangalam Madhur, Barton Sophie A, Wagman Jeffrey B, Fragaszy Dorothy M, Newell Karl M
Department of Psychology, University of Georgia, Athens, GA, USA.
Department of Psychology, Illinois State University, Normal, IL, USA.
Atten Percept Psychophys. 2017 Nov;79(8):2499-2509. doi: 10.3758/s13414-017-1403-9.
Rotational inertia-a mechanical quantity that describes the differential resistance of an object to angular acceleration in different directions-has been shown to support perception of the properties of that object through dynamic touch (wielding). The goal of the present study was to examine if perception of the length of an object through dynamic touch depends on its rotational inertia, independent of the medium in which it is wielded. The participants (n = 14) wielded 12 different objects held in air or completely immersed in water and reported perceived lengths of those objects. Each object consisted of a rod of a particular density with a particular number of stacked steel rings attached at a particular location along its length. Perceived length was invariant across medium. In addition, a single-valued function of the major eigenvalue, I , and the minor eigenvalue, I , of the rotational inertia, I, of the 12 objects predicted the perceived lengths of those objects in both air and water, and the perceived lengths were invariant across the two media. These results support the hypothesis that the informational support for perception of the length of an object through dynamic touch is invariant across changes in the medium.
转动惯量——一个描述物体在不同方向上对角加速度的差异阻力的力学量——已被证明通过动态触摸（挥舞）来支持对该物体属性的感知。本研究的目的是检验通过动态触摸对物体长度的感知是否取决于其转动惯量，而与挥舞物体的介质无关。参与者（n = 14）挥舞着12个不同的物体，这些物体要么拿在空气中，要么完全浸没在水中，并报告他们对这些物体感知到的长度。每个物体由一根具有特定密度的杆组成，杆上沿着其长度的特定位置附着有特定数量的堆叠钢环。感知到的长度在不同介质中是不变的。此外，这12个物体的转动惯量I的主特征值I和次特征值I的单值函数预测了这些物体在空气和水中的感知长度，并且感知长度在两种介质中是不变的。这些结果支持了这样一个假设，即通过动态触摸对物体长度感知的信息支持在介质变化时是不变的。
