Low autocorrelation can be a sign of a poor quality channel or component. Often these are noisy, poor contact, or heavily contaminated with muscle noise. Low autocorrelation at a lag of 20ms is often associated with muscle noise.
ar_acf(data, ...) # S3 method for eeg_ICA ar_acf(data, ms = 20, plot = TRUE, verbose = TRUE, threshold = NULL, ...)
data |
|
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... | additional parameters |
ms | Time lag to check ACF, in milliseconds. Defaults to 20 ms. |
plot | Produce plot showing ACF and threshold for all EEG components. |
verbose | Print informative messages. Defaults to TRUE. |
threshold | Specify a threshold for low ACF. NULL estimates the threshold automatically. |
eeg_ICA
: Autocorrelation checker for eeg_ICA
objects
Chaumon, M., Bishop, D.V., Busch, N.A. (2015). A practical guide to the selection of independent components of the electroencephalogram for artifact correction. J Neurosci Methods. Jul 30;250:47-63. doi: 10.1016/j.jneumeth.2015.02.025