Implicit and Explicit Representations of Hand Position in Tool Use
Implicit and Explicit Representations of Hand Position in Tool Use
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DOI：
10.1371/journal.pone.0068471
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发表时间：
2013-07-19
期刊：
影响因子：
3.7
通讯作者：
Heuer, Herbert
中科院分区：
文献类型：
--
作者：
Rand, Miya K.;Heuer, Herbert
了解工具使用中视觉和本体感受信息的相互作用是很重要的，因为它是学习工具运动学变换和熟练操作的基础。本研究探讨了中枢神经系统如何结合看到光标的位置和感觉手的位置下的视觉运动旋转范式。年轻人和老年人参与者在数字化仪上进行瞄准运动，同时在监视器上查看旋转的视觉反馈。在每次移动之后，他们判断本体感知的手的方向或视觉感知的光标方向。我们发现了一个强大的视觉优势的不对称的相互偏见。此外，我们发现了一些显式和隐式判断手的方向之间的差异。外显判断比内隐判断具有更大的变异性。外显判断对光标方向的偏向大约是内隐判断的两倍。外显判断和内隐判断的个体偏差不相关。这些判断的偏差表现出相反的顺序效应。此外，这些判断之间的年龄相关变化也不同。随着年龄的增长，只有外显判断的判断变异性降低，对光标方向的偏向性增加。这些结果表明，不同的显式和隐式的神经表征的手的方向，不同的视觉系统的概念相似。
Understanding the interactions of visual and proprioceptive information in tool use is important as it is the basis for learning of the tool's kinematic transformation and thus skilled performance. This study investigated how the CNS combines seen cursor positions and felt hand positions under a visuo-motor rotation paradigm. Young and older adult participants performed aiming movements on a digitizer while looking at rotated visual feedback on a monitor. After each movement, they judged either the proprioceptively sensed hand direction or the visually sensed cursor direction. We identified asymmetric mutual biases with a strong visual dominance. Furthermore, we found a number of differences between explicit and implicit judgments of hand directions. The explicit judgments had considerably larger variability than the implicit judgments. The bias toward the cursor direction for the explicit judgments was about twice as strong as for the implicit judgments. The individual biases of explicit and implicit judgments were uncorrelated. Biases of these judgments exhibited opposite sequential effects. Moreover, age-related changes were also different between these judgments. The judgment variability was decreased and the bias toward the cursor direction was increased with increasing age only for the explicit judgments. These results indicate distinct explicit and implicit neural representations of hand direction, similar to the notion of distinct visual systems.