[Eeglablist] Topoplot: can it just plot the electrode values and not interpolate them?

Jonathan Kane jakane007 at gmail.com
Fri Jul 7 12:08:16 PDT 2017

   I am worried about interpolation artifacts in topoplot.  I therefore
want to plot the value at each electrode location as a colored and filled
circle (where the color corresponds to the value at the electrode), and not
interpolate between them.  I can't seem to find an option in topoplot to do
that.  It CAN plot the locations of the electrodes using the 'style' -
'blank' combination along with the 'emarker' option, but it can't plot
different electrode values as corresponding colors.

I tried a second approach:  Since what I essentially want to do is plot the
electrode values as a scatter plot, I tried to overlay a scatter.m plot on
top of the head outline given by topoplot.  I used the X, Y information in
EEG.chanlocs as the coordinates, but it seems that both of the X and Y
limits on the topoplot have been set to [-0.5250 0.5250] (i.e., it doesn't
seem to use the actual X, Y locations of the electrodes, but transforms
them onto a different grid).  Any idea how that is done so that I can do
the coordinate transformation myself and then use scatter.m?


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