Shortly, the dataset contains 40 ERP curves in its 251 first columns. The last two colums, named Subject and Instruction, gives for each curve the corresponding subject and its membership to an experimental group. The following command produces a plot of the ERP curves:
erpcolors = ifelse(erpcz$Instruction=="TBF","orange","blue")
erpplot(dta=erpcz[,1:251],frames=seq(0,1001,4),
xlab="Time (ms)",ylab="ERP",lwd=1.5,lty=1,
main="ERP at electrode CZ",col=erpcolors)
legend("bottomleft",lty=c(1,1),lwd=1.5,col=c("orange","blue"),
legend=c("TBF","TBR"))
A plot is generated with the following content:
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