eegcap2d {eegkit}

Draws 2D EEG Cap

Description

Creates two-dimensional plot of electroencephalography (EEG) cap with user-input electrodes. Currently supports 84 scalp electrodes, and plots according to the international 10-10 system. Includes customization options (e.g., each electrode can have a unique plotting color, size, label color, etc.).

Usage

eegcap2d(electrodes = "10-10", axes = FALSE, asp = 1, 
         cex.point = 2.75, col.point = "green", pch.point = 19,
         cex.border = 2.75, col.border = "black", pch.border = 21,
         cex.label = 0.5, col.label = "black", 
         head = TRUE, nose = TRUE, ears = TRUE, 
         main = "", xlab = "", ylab = "", 
         xlim = c(-13.7, 13.7), ylim = c(-13.7, 13.7), ...)

Arguments

electrodes

Character vector with electrodes to plot. Each element of electrodes must match one of the 89 reference electrodes (see Details). Mismatches are ignored (not plotted). Input is NOT case sensitive. Default plots all available electrodes (full 10-10 system).

axes

If FALSE (default), no axes are plotted.

asp

Aspect ratio for plot (defaults to 1).

cex.point

Character EXpansion value for electrodes. Set to a negative value to suppress the electrode plotting.

col.point

Color for electrodes. Ignored if cex.point < 0.

pch.point

Plotting character for electrodes. Ignored if cex.point < 0.

cex.border

Character EXpansion value for electrode borders. Set to a negative value to suppress the electrode border plotting.

col.border

Color for electrode borders. Ignored if cex.border < 0.

pch.border

Plotting character for electrode borders. Ignored if cex.border < 0.

cex.label

Character EXpansion value for electrode labels. Set to a negative value to suppress the electrode label plotting.

col.label

Color for electrode labels. Ignored if cex.label < 0.

head

If TRUE, a circle is plotted to represent the subject's head.

nose

If TRUE, a triangle is plotted to represent the subject's nose.

ears

If TRUE, two ovals are plotted to represent the subject's ears.

main

Title to use for plot. Default is no title.

xlab, ylab

x-axis and y-axis labels for the plot. Default is no axis labels.

xlim, ylim

x-axis and y-axis limits for the plot.

...

Optional inputs for plot function.

Details

Currently supports 84 scalp electrodes (plus ears and nose): A1 A2 AF1 AF2 AF3 AF4 AF5 AF6 AF7 AF8 AFZ C1 C2 C3 C4 C5 C6 CP1 CP2 CP3 CP4 CP5 CP6 CPZ CZ F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 FC1 FC2 FC3 FC4 FC5 FC6 FCZ FP1 FP2 FPZ FT7 FT8 FT9 FT10 FZ I1 I2 IZ NZ O1 O2 OZ P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10 POZ PZ T7 T8 T9 T10 TP7 TP8 TP9 TP10

See eegcoord for the coordinates used to create plot.

Value

Produces plot of EEG cap.

Note

Unlike the eegcap function, this function does not use par$plt for the figure positioning.

Author(s)

Nathaniel E. Helwig <[e-mail]>

References

Oostenveld, R., and Praamstra, P. (2001). The Five percent electrode system for high-resolution EEG and ERP measurements. Clinical Neurophysiology, 112, 713-719.

See Also

See eegcap for a similar implementation, which also supports 3d EEG cap plotting.

Examples

##########   EXAMPLE 1   ##########

# plot 10-10 system (default):

# plot full cap (default options)
eegcap2d()

# plot full cap (different color for ears and nose)
data(eegcoord)
mycols <- rep(NA, 87)
enames <- rownames(eegcoord)
mycols[enames=="A1"] <- "green"
mycols[enames=="A2"] <- "light blue"
mycols[enames=="NZ"] <- "pink"
eegcap2d(col.point = mycols)



##########   EXAMPLE 2   ##########

# plot 10-20 system:

# plot cap with labels
eegcap2d("10-20")

# plot cap without labels
eegcap2d("10-20", cex.label = -1)



##########   EXAMPLE 3   ##########

# plot custom subset of electrodes
myelectrodes <- c("FP1","FP2","FPZ","F7","F3","FZ",
                  "F4","F8","T7","C3","CZ","C4","T8",
                  "P7","P3","PZ","P4","P8","O1","O2")
eegcap2d(myelectrodes)