Pagano C C, Kinsella-Shaw J M, Cassidy P E, Turvey M T
Center for the Ecological Study of Perception and Action, University of Connecticut, Storrs 06269-1020.
J Exp Psychol Hum Percept Perform. 1994 Apr;20(2):276-85. doi: 10.1037//0096-1523.20.2.276.
When an object is held and wielded, a time-invariant quantity of the wielding dynamics is the inertia tensor Iij. Examination of Iij as a function of different locations at which a cylindrical object is grasped revealed that the off-diagonal components of Iij--the products of inertia--related most systematically to grip position. In 3 experiments, Ss wielded an occluded rod held at an intermediate point along its length and reproduced, with the other hand, the felt grip position on a visible rod. In Experiment 1, the wielded rods were homogeneous; in Experiments 2 and 3, weights were added on either side of the grasp, with different manners of grasp contrasted in Experiment 3. In all 3 experiments, perceived hand position was predicted by Iij. Discussion was focused on the role of Iij's eigenvalues in perceiving the magnitudes of objects and Iij's eigenvectors in perceiving hand-object relations (e.g., position of grasp).
当握持并挥舞一个物体时，挥舞动力学中一个不随时间变化的量是惯性张量Iij。将Iij作为在不同位置握持圆柱形物体时的函数进行研究发现，Iij的非对角分量——惯性积——与握持位置的相关性最为系统。在3个实验中，被试挥舞一根在其长度中点处握持的遮挡棒，并用另一只手在可见棒上重现感觉到的握持位置。在实验1中，挥舞的棒是均匀的；在实验2和3中，在握持点的两侧添加了重物，实验3中对比了不同的握持方式。在所有3个实验中，Iij都能预测感知到的手部位置。讨论集中在Iij的特征值在感知物体大小时的作用以及Iij的特征向量在感知手与物体关系（如握持位置）时的作用。
