How inappropriate high-pass filters can produce artifactual effects and incorrect conclusions in ERP studies of language and cognition.
How inappropriate high-pass filters can produce artifactual effects and incorrect conclusions in ERP studies of language and cognition.
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DOI：
10.1111/psyp.12437
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发表时间：
2015-08
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：
Tanner D;Morgan-Short K;Luck SJ
虽然众所周知，高通滤波器可以降低慢速ERP分量的幅度，但这些滤波器也会引入伪峰，导致错误的结论。为了证明这一点并提供关于最佳过滤器设置的证据，我们记录了涉及句法和语义违规的典型语言处理范式中的事件相关电位。未经过滤的结果显示，在语义和句法违反条件下，N400和P600分别具有标准效应。然而，截止频率在0.3赫兹及以上的高通滤波器在产生真实效果之前会产生相反极性的伪像效果。也就是说，在句法条件下，过度高通过滤在P600之前引入了显著的N400效应，在语义条件下在N400之前引入了显著的P2效应。因此，不适当地使用高通滤波器可能会导致关于哪些组件受给定操作影响的错误结论。本研究结果还为高通滤波器设置提供了实用建议，使统计功率最大化，同时使滤波伪像最小化。
Although it is widely known that high-pass filters can reduce the amplitude of slow ERP components, these filters can also introduce artifactual peaks that lead to incorrect conclusions. To demonstrate this and provide evidence about optimal filter settings, we recorded ERPs in a typical language processing paradigm involving syntactic and semantic violations. Unfiltered results showed standard N400 and P600 effects in the semantic and syntactic violation conditions, respectively. However, high-pass filters with cutoffs at 0.3 Hz and above produced artifactual effects of opposite polarity before the true effect. That is, excessive high-pass filtering introduced a significant N400 effect preceding the P600 in the syntactic condition, and a significant P2 effect preceding the N400 in the semantic condition. Thus, inappropriate use of high-pass filters can lead to false conclusions about which components are influenced by a given manipulation. The present results also lead to practical recommendations for high-pass filter settings that maximize statistical power while minimizing filtering artifacts.