Material evidence: interaction of well-learned priors and sensorimotor memory when lifting objects
Material evidence: interaction of well-learned priors and sensorimotor memory when lifting objects
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DOI：
10.1152/jn.00263.2012
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发表时间：
2012-09-01
影响因子：
2.5
通讯作者：
Flanagan, J. Randall
中科院分区：
文献类型：
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作者：
Baugh, Lee A.;Kao, Michelle;Flanagan, J. Randall
Baugh LA，Kao M，Johansson RS，Flanagan JR.物证：提物时，经验丰富的先前记忆与感觉运动记忆的相互作用。J Neurophysiol 108：1262-1269，2012.首次发表于2012年6月13日; doi：10.1152/jn.00263.2012.-熟练的物体提升需要预测物体重量。当提升新物体时，这种预测是基于熟知的尺寸-重量和材料-密度相关性或先验知识。然而，如果预测是错误的，人们很快就知道了特定物体的重量，并可以在再次举起物体时使用这种知识，称为感觉运动记忆。在本研究中，我们探讨了感觉运动记忆，当举起一个给定的物体时，如何与学习良好的材料密度先验相互作用，预测一个更大但外观相似的物体的重量。不同组的参与者首先举起4个小物体中的1个10次。这些包括一对填充木材的物体和一对填充黄铜的物体，其中每对中的一个覆盖在木材单板上，另一个覆盖在黄铜单板上。然后，所有的小组都举起一个更大的，黄铜填充的物体，与他们举起的小物体相同。对于每次升降机，我们确定了垂直载荷力率和载荷阶段持续时间的初始峰值变化率，这提供了预测物体重量的估计。对小立方体的第10次提升的分析显示，表面材料没有影响，这表明参与者学会了提升小立方体所需的适当力量，而不管物体的外观如何。然而，小立方体的表面材料和核心材料都影响了大块的第一次提升。我们的结论是，感觉运动记忆相关的对象密度可以有助于重量预测时，解除新的对象，但也长期先验相关的材料性能可以影响预测。
Baugh LA, Kao M, Johansson RS, Flanagan JR. Material evidence: interaction of well-learned priors and sensorimotor memory when lifting objects. J Neurophysiol 108: 1262-1269, 2012. First published June 13, 2012; doi:10.1152/jn.00263.2012.-Skilled object lifting requires the prediction of object weight. When lifting new objects, such prediction is based on well-learned size-weight and material-density correlations, or priors. However, if the prediction is erroneous, people quickly learn the weight of the particular object and can use this knowledge, referred to as sensorimotor memory, when lifting the object again. In the present study, we explored how sensorimotor memory, gained when lifting a given object, interacts with well-learned material-density priors when predicting the weight of a larger but otherwise similar-looking object. Different groups of participants 1st lifted 1 of 4 small objects 10 times. These included a pair of wood-filled objects and a pair of brass-filled objects where 1 of each pair was covered in a wood veneer and the other was covered in a brass veneer. All groups then lifted a larger, brass-filled object with the same covering as the small object they had lifted. For each lift, we determined the initial peak rate of change of vertical load-force rate and the load-phase duration, which provide estimates of predicted object weight. Analysis of the 10th lift of the small cube revealed no effects of surface material, indicating participants learned the appropriate forces required to lift the small cube regardless of object appearance. However, both surface material and core material of the small cube affected the 1st lift of the large block. We conclude that sensorimotor memory related to object density can contribute to weight prediction when lifting novel objects but also that long-term priors related to material properties can influence the prediction.