How soft is that pillow? The perceptual localization of the hand and the haptic assessment of contact rigidity.
How soft is that pillow? The perceptual localization of the hand and the haptic assessment of contact rigidity.
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DOI：
10.1523/jneurosci.4656-10.2011
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发表时间：
2011-04-27
期刊：
影响因子：
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通讯作者：
Mussa-Ivaldi FA
中科院分区：
文献类型：
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作者：
Pressman A;Karniel A;Mussa-Ivaldi FA
描述了一种新的触觉错觉，其中移动物体的位置影响其刚性的感知。肢体位置感是大脑将持续的感觉信息与先前经验产生的期望结合起来产生的，这一观点得到了理论和实验的支持。这种概率状态信息是如何影响一个人对环境机制的触觉感知的？在一个简单的估计过程中，受试者被要求报告两个模拟虚拟物体的相对刚度。其中一个物体在空间中保持固定，并具有不同的刚度系数。另一个虚拟物体具有恒定的刚度，但相对于受试者移动。早期的研究表明，对物体刚性的感知与接触力和物体边界内穿透的感知量之间的回归过程是一致的。被测者感知到的穿透量受到物体位置变化的影响。这反过来又对接触的感知刚性产生了可预测的影响。受试者对物体相对刚性的报告最好用概率模型来解释，在概率模型中，物体的感知边界是根据其当前位置和过去的观察来估计的。因此，接触刚性的感知是由手部本体感觉定位下的随机状态估计过程来解释的。
A new haptic illusion is described, in which the location of the mobile object affects the perception of its rigidity. There is theoretical and experimental support to the notion that limb position sense results from the brain combining ongoing sensory information with expectations arising from prior experience. How does this probabilistic state information affect one’s tactile perception of the environment mechanics? In a simple estimation process human subjects were asked to report the relative rigidity of two simulated virtual objects. One of the objects remained fixed in space and had various coefficients of stiffness. The other virtual object had constant stiffness but moved with respect to the subjects. Earlier work suggested that the perception of an object’s rigidity is consistent with a process of regression between the contact force and the perceived amount of penetration inside the object’s boundary. The amount of penetration perceived by the subject was affected by varying the position of the object. This, in turn, had a predictable effect on the perceived rigidity of the contact. Subjects’ reports on the relative rigidity of the object are best accounted for by a probabilistic model in which the perceived boundary of the object is estimated based on its current location and on its past observations. Therefore, the perception of contact rigidity is accounted for by a stochastic process of state estimation underlying proprioceptive localization of the hand.