| TOPOPLOT | Plot a topographic map of an EEG field as a 2-D circular view (looking down at the top of the head) using cointerpolation on a fine cartesian grid. |
| Usage: | >> topoplot(datavector,'eloc_file'); >> topoplot(datavector,'eloc_file', 'Param1','Value1', ...) |
| Inputs: | |
datavector |
vector of values at the corresponding locations. |
'eloc_file' |
name of an EEG electrode position file {0 -> 'chan_file'} |
| Optional Parameters: | |
'colormap' |
any sized colormap |
'interplimits' |
'electrodes' to furthest electrode 'head' to edge of head {default 'head'} |
'gridscale' |
scaling grid size {default 67} |
'maplimits' |
'absmax' +/- the absolute-max 'maxmin' scale to data range [clim1,clim2] user-definined lo/hi |
{default |
'absmax'} |
'style' |
'straight' colormap only 'contour' contour lines only 'both' both colormap and contour lines 'fill' constant color between lines 'blank' just head and electrodes |
{default |
'both'} |
'numcontour' |
number of contour lines |
{default |
6} |
'shading' |
'flat','interp' {default = 'flat'} |
'headcolor' |
Color of head cartoon {default black} |
'electrodes' |
'on','off','labels','numbers' |
'efontsize' |
detail |
'electcolor' |
detail |
'emarker' |
detail |
'emarkersize' |
detail |
| Eloc_file format: | chan_number degrees radius reject_level amp_gain channel_name (Angle-0 =Cz-to-Fz; C3-angle =-90; Radius at edge of image = 0.5) For a sample eloc file: >> topoplot example |
| Note: | 1) topoplot only works when map limits are >= the max and min interpolated data values. 2) topoplot will ignore any electrode with a position outside the head (radius > 0.5). To make the head round, >> axis square |
| Authors: | Andy Spydell & Colin Humphries, CNL / Salk Institute, Aug, 1996 |
| See also: | timtopo, envtopo |