plot_avgba

An <code>icac</code> object as returned by the function of the same name.

The uncorrected data that was supplied to function <code>icac</code>.

data

channel

Integer. The number of time courses to plot. Defaults to <code>NULL</code>, which results in the number time courses per window equal to the number of channels to plot up to 10.

n.win

<code>NULL</code> or a logical value.  If <code>TRUE</code> (the default), the user will be prompted before a new page of output is started.

new.page

The name of the column that contains time information.

time.cn

Further arguments to be passed to <code>plot</code> and <code>lines</code>.

For each channel, the average for uncorrected (black line) and corrected (blue line) waveforms across all trials is computed and plotted.

Removes eye-movement and other types of known (i.e., recorded) or unknown (i.e., not recorded) artifacts using the fastICA package. The correction method proposed in this package is largely based on the method described in on Flexer, Bauer, Pripfl, and Dorffner (2005). The process of correcting electro- and magneto-encephalographic data (EEG/MEG) begins by running function ``icac'', which first performs independent components analysis (ICA) to decompose the data frame into independent components (ICs) using function ``fastICA'' from the package of the same name. It then calculates for each trial the correlation between each IC and each one of the noise signals -- there can be one or more, e.g., vertical and horizontal electro-oculograms (VEOG and HEOG), electro-myograms (EMG), electro-cardiograms (ECG), galvanic skin responses (GSR), and other noise signals. Subsequently, portions of an IC corresponding to trials at which the correlation between it and a noise signal was at or above threshold (set to 0.4 by default; Flexer et al., 2005, p. 1001) are zeroed-out in the source matrix, ``S''. The user can then identify which ICs correlate with the noise signals the most by looking at the summary of the ``icac'' object (using function ``summary.icac''), the scalp topography of the ICs (using function ``topo_ic''), the time courses of the ICs (using functions ``plot_tric'' and ``plot_nic''), and other diagnostic plots. Once these ICs have been identified, they can be completely zeroed-out using function ``update.icac'' and the resulting correction checked using functions ``plot_avgba'' and ``plot_trba''. Some worked-out examples with R code are provided in the package vignette.

plot_avgba: Plot the average waveforms at each channel before and after correction.

Description

Usage

Arguments

Value

See Also

Examples