Neural decoding using gyral and intrasulcal electrocorticograms
Neural decoding using gyral and intrasulcal electrocorticograms
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DOI：
10.1016/j.neuroimage.2008.12.069
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发表时间：
2009-05-01
期刊：
影响因子：
5.7
通讯作者：
Yoshimine, Toshiki
中科院分区：
文献类型：
--
作者：
Yanagisawa, Takufumi;Hirata, Masayuki;Yoshimine, Toshiki
初级运动皮层（M1）的皮层电图是用于控制脑-机接口（BCI）的有前途的工具。很少检查人中央沟内M1的皮层电图（ECoG）。为了评价脑沟内皮层脑电图对脑机接口的有用性，我们检查了暂时放置在中央沟内和感觉运动皮层（脑回皮层脑电图）上的硬膜下电极的患者。五名患者被要求执行或想象两个或三个类的简单上肢运动。结果的单变量统计分析显示，M1上的龈内ECoG在运动类别之间显示出显著的变异性。使用支持向量机对单次ECoG信号进行分类，以推断运动类别（神经解码）。运动类别的预测准确率为80-90%（机会水平：33%或50%）。为了揭示神经解码的解剖区域的相对重要性，解码性能之间的回和intrasulcal ECoGs进行了比较。在运动组上的龈内皮层电图表现出比等大小的回皮层电图或感觉组上的龈内皮层电图更高的性能。使用短时间窗口的分析表明，甚至可以在运动开始之前解码运动类别。这些结果表明，M1上的龈内ECoG推断上肢运动的有用性，并提出了一个有前途的应用，为一个实际的BCI系统。(C)2009 Elsevier Inc. All rights reserved.
Electrocorticography of the primary motor cortex (M1) is a promising tool for controlling a brain-computer interface (BCI). Electrocorticograms (ECoG) of the human M1 within the central sulcus (intrasulcal ECoG) have been rarely examined. In order to evaluate the usefulness of intrasulcal ECoG for BCI, we examined patients with subdural electrodes placed temporarily inside the central sulcus and over the sensorimotor cortex (gyral ECoG). Five patients were asked to perform or imagine two or three classes of simple upper limb movements. Univariate statistical analysis of the results revealed that the intrasulcal ECoG on M1 showed significant variability across movement classes. A support vector machine was used for classification of single-trial ECoG signals to infer movement class (neural decoding). The movement classes were predicted with 80-90% accuracy (chance level: 33% or 50%). To reveal the relative importance of anatomical areas for neural decoding, the decoding performance was compared between gyral and intrasulcal ECoGs. The intrasulcal ECoG on the motor bank showed higher performance than the equally-sized gyral ECoG or the intrasulcal ECoG on the sensory bank. Analysis using a short time window revealed that movement class could be decoded even before movement onset. These results suggest the usefulness of intrasulcal ECoG on M1 to infer upper limb movements and present a promising application for a practical BCI system. (C) 2009 Elsevier Inc. All rights reserved.