# Draws 2D EEG Cap 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.). ```r 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. ## Returns Produces plot of EEG cap. ## References Oostenveld, R., and Praamstra, P. (2001). The Five percent electrode system for high-resolution EEG and ERP measurements. **Clinical Neurophysiology, 112**, 713-719. ## Author(s) Nathaniel E. Helwig ## Note Unlike the `eegcap` function, this function does not use `par$plt` for the figure positioning. ## See Also See `eegcap` for a similar implementation, which also supports 3d EEG cap plotting. ## Examples ```r ########## 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) ```

eegcap2d function