Abstract：
:The event-related potential (ERP) and event-related field (ERF) techniques provide valuable insights into the time course of processes in the brain. Because neural signals are typically weak, researchers commonly filter the data to increase the signal-to-noise ratio. However, filtering may distort the data, leading to false results. Using our own EEG data, we show that acausal high-pass filtering can generate a systematic bias easily leading to misinterpretations of neural activity. In particular, we show that the early ERP component C1 is very sensitive to such effects. Moreover, we found that about half of the papers reporting modulations in the C1 range used a high-pass digital filter cut-off above the recommended maximum of 0.1 Hz. More generally, among 185 relevant ERP/ERF publications, 80 used cutoffs above 0.1 Hz. As a consequence, part of the ERP/ERF literature may need to be re-analyzed. We provide guidelines on how to minimize filtering artifacts.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Acunzo DJ,Mackenzie G,van Rossum MCdoi
10.1016/j.jneumeth.2012.06.011subject
Has Abstractpub_date
2012-07-30 00:00:00pages
212-8issue
1eissn
0165-0270issn
1872-678Xpii
S0165-0270(12)00236-1journal_volume
209pub_type
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