The impact of electrode characteristics on electrocorticography (ECoG).
The impact of electrode characteristics on electrocorticography (ECoG).
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电极特性对皮质电图（ECoG）的影响。
DOI：
10.1109/iembs.2011.6090842
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Wang,Wei
中科院分区：
文献类型：
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作者：
Wodlinger,Brian;Degenhart,AlanD;Collinger,JenniferL;Tyler-Kabara,ElizabethC;Wang,Wei
自从20世纪50年代Penfield和碧玉的开创性工作以来，皮层电图（ECoG）被临床应用，最近被研究为一种有前途的脑机接口技术。许多研究人员试图分析ECoG记录的属性，包括预测最佳电极间距和预期的更小电极的分辨率提高。本文应用体积导体的解析模型来研究不同尺寸电极的灵敏度场。对于小于~ 1 mm的电极，空间分辨率的益处最小，而较小的电极导致信噪比急剧下降。电极对之间的时间相关性的预测范围内的间距和相关值进行比较，从一系列的记录在受试者进行监测的难治性癫痫。所观察到的相关性被认为是远远高于预测的分析模型，并建议一个更详细的模型，皮层活动，以确定适当的ECoG网格间距。
Used clinically since Penfield and Jasper's pioneering work in the 1950's, electrocorticography (ECoG) has recently been investigated as a promising technology for brain-computer interfacing. Many researchers have attempted to analyze the properties of ECoG recordings, including prediction of optimal electrode spacing and the improved resolution expected with smaller electrodes. This work applies an analytic model of the volume conductor to investigate the sensitivity field of electrodes of various sizes. The benefit to spatial resolution was minimal for electrodes smaller than ~1mm, while smaller electrodes caused a dramatic decrease in signal-to-noise ratio. The temporal correlation between electrode pairs is predicted over a range of spacings and compared to correlation values from a series of recordings in subjects undergoing monitoring for intractable epilepsy. The observed correlations are found to be much higher than predicted by the analytic model and suggest a more detailed model of cortical activity is needed to identify appropriate ECoG grid spacing.