Sensorimotor Memory Biases Weight Perception During Object Lifting.
Sensorimotor Memory Biases Weight Perception During Object Lifting.
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DOI：
10.3389/fnhum.2015.00700
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发表时间：
2015
影响因子：
2.9
通讯作者：
Davare M
中科院分区：
文献类型：
--
作者：
van Polanen V;Davare M
当举起一个物体时，大脑使用视觉线索和内部物体表征来预测它的重量并相应地调整指尖的力量。一旦可用，触觉信息被快速集成以更新权重预测并细化内部对象表示。如果视觉提示不能用来预测重量，力量规划依赖于从最近的提升经验，称为感觉运动记忆获得的内隐知识。在这里，我们调查了是否感知的重量是类似的偏见，根据以前的起重经验，这是如何与力缩放。参与者以半随机的顺序抓住并举起一系列轻或重的物体，并估计它们的重量。正如预期的那样，我们发现力是根据以前的升降机（感觉运动记忆）来缩放的，这些影响取决于最近的升降机经验的长度。重要的是，知觉重量估计也受到前一次举重的影响，导致与轻举重相比，重举重后的估计值较低。此外，重量估计与计划力参数的大小呈负相关。这种感知偏差只在当前的电梯是轻的，但不重，因为感觉运动记忆效应的大小，根据韦伯定律，相对较轻的物体相比，对重的影响较小。一个对照实验测试了主动举重在调节这些感知变化中的重要性，结果表明，当重量被动地施加在手上时，没有发现以前的感觉经验对感知的影响。这些结果突出了如何快速学习新的物体提升动力学可以塑造重量感知，并展示了动作规划和感知控制之间的紧密联系。如果预测力缩放和实际物体重量不匹配，则快速实施以缩小力的在线电机校正也将以成比例的方式缩小重量估计。
When lifting an object, the brain uses visual cues and an internal object representation to predict its weight and scale fingertip forces accordingly. Once available, tactile information is rapidly integrated to update the weight prediction and refine the internal object representation. If visual cues cannot be used to predict weight, force planning relies on implicit knowledge acquired from recent lifting experience, termed sensorimotor memory. Here, we investigated whether perception of weight is similarly biased according to previous lifting experience and how this is related to force scaling. Participants grasped and lifted series of light or heavy objects in a semi-randomized order and estimated their weights. As expected, we found that forces were scaled based on previous lifts (sensorimotor memory) and these effects increased depending on the length of recent lifting experience. Importantly, perceptual weight estimates were also influenced by the preceding lift, resulting in lower estimations after a heavy lift compared to a light one. In addition, weight estimations were negatively correlated with the magnitude of planned force parameters. This perceptual bias was only found if the current lift was light, but not heavy since the magnitude of sensorimotor memory effects had, according to Weber’s law, relatively less impact on heavy compared to light objects. A control experiment tested the importance of active lifting in mediating these perceptual changes and showed that when weights are passively applied on the hand, no effect of previous sensory experience is found on perception. These results highlight how fast learning of novel object lifting dynamics can shape weight perception and demonstrate a tight link between action planning and perception control. If predictive force scaling and actual object weight do not match, the online motor corrections, rapidly implemented to downscale forces, will also downscale weight estimation in a proportional manner.