Improved Sensorimotor Performance via Stochastic Resonance
Improved Sensorimotor Performance via Stochastic Resonance
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DOI：
10.1523/jneurosci.0680-12.2012
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发表时间：
2012-09-05
影响因子：
5.3
通讯作者：
Kristeva, Rumyana
中科院分区：
文献类型：
--
作者：
Mendez-Balbuena, Ignacio;Manjarrez, Elias;Kristeva, Rumyana
一些关于噪声增强平衡控制的研究支持随机共振可以增强运动任务中感觉运动系统的检测和传输的假设。本研究的目的是在一个更简单和受控的任务中扩展这些发现。我们探讨了在食指上施加特定水平的机械高斯噪声（0-15 Hz）是否可以在补偿由操纵器产生的静态力期间提高性能。手指位置在监视器上显示为灰色圆圈中心的小白色点。当受试者表现出与该圆心的低偏差时，并且当表现随时间变化较小时，我们认为表现良好。对机械臂施加了不同程度的机械噪声。我们比较了零噪声（ZN），最佳噪声（ON）和高噪声（HN）之间的性能。在所有受试者（8/8）中，数据显示位置平均变化的倒数与输入噪声水平之间呈倒U形图。换句话说，ON期间的平均变化显著小于ZN或HN期间。研究结果表明，应用一个竞争性本体感受噪声可以通过随机共振提高感觉运动性能的稳定性。这种改善运动精度的可能解释是增加了外周受体的敏感性和内部随机共振，从而导致更好的感觉运动整合和皮质肌同步的增加。
Several studies about noise-enhanced balance control in humans support the hypothesis that stochastic resonance can enhance the detection and transmission in sensorimotor system during a motor task. The purpose of the present study was to extend these findings in a simpler and controlled task. We explored whether a particular level of a mechanical Gaussian noise (0-15 Hz) applied on the index finger can improve the performance during compensation for a static force generated by a manipulandum. The finger position was displayed on a monitor as a small white point in the center of a gray circle. We considered a good performance when the subjects exhibited a low deviation from the center of this circle and when the performance had less variation over time. Several levels of mechanical noise were applied on the manipulandum. We compared the performance between zero noise (ZN), optimal noise (ON), and high noise (HN). In all subjects (8 of 8) the data disclosed an inverted U-like graph between the inverse of the mean variation in position and the input noise level. In other words, the mean variation was significantly smaller during ON than during ZN or HN. The findings suggest that the application of a tactile-proprioceptive noise can improve the stability in sensorimotor performance via stochastic resonance. Possible explanations for this improvement in motor precision are an increase of the peripheral receptors sensitivity and of the internal stochastic resonance, causing a better sensorimotor integration and an increase in corticomuscular synchronization.