The effects of electrode impedance on data quality and statistical significance in ERP recordings.
The effects of electrode impedance on data quality and statistical significance in ERP recordings.
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DOI：
10.1111/j.1469-8986.2010.01009.x
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发表时间：
2010-09
期刊：
影响因子：
3.7
通讯作者：
Luck SJ
中科院分区：
文献类型：
--
作者：
Kappenman ES;Luck SJ
为了确定高电极阻抗是否有意义地降低了数据质量，在一个古怪的任务期间同时记录了低阻抗和高阻抗电极部位的EEG。低频噪声被发现增加在高阻抗网站相对于低阻抗网站，特别是当记录环境是温暖和潮湿的。高阻抗部位的噪声增加导致在P3振幅分析中获得统计学显著性所需的试验次数增加，但这可以通过高通滤波和伪影抑制部分缓解。高电极阻抗并没有减少N1波的统计功率，除非记录环境是温暖和潮湿的。因此，在某些条件下，高电极阻抗可能会增加噪声并降低统计功率，但这些影响可以通过使用凉爽干燥的记录环境和适当的信号处理方法来减少。
To determine whether data quality is meaningfully reduced by high electrode impedance, EEG was recorded simultaneously from low- and high-impedance electrode sites during an oddball task. Low-frequency noise was found to be increased at high-impedance sites relative to low-impedance sites, especially when the recording environment was warm and humid. The increased noise at the high-impedance sites caused an increase in the number of trials needed to obtain statistical significance in analyses of P3 amplitude, but this could be partially mitigated by high-pass filtering and artifact rejection. High electrode impedance did not reduce statistical power for the N1 wave unless the recording environment was warm and humid. Thus, high electrode impedance may increase noise and decrease statistical power under some conditions, but these effects can be reduced by using a cool and dry recording environment and appropriate signal processing methods.
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