Hi Ziad,

My goal is create topographic voltage maps from intracranial EEG recordings. There are 128 recording sites on the cortical surface of each patient (for each of which I have a talairach coordinate). The intracranial electrode locations are idiosyncratic (as opposed to scalp EEG in which electrodes locations conform to placement standards). To create the topographical map I need coordinates in a 2 dimensional space that reflect the distances between electrodes. Looking at the flat map coords for each 3dcoord seems to do the trick, but ideally I'd like to be able to simply input a list of coords (e.g. x y z for each of 128 channels) and get the the 2D flat map coords returned.

Hopefully I've made things clearer and not more opaque! Please let me know if there's anything else I can tell you that would help you help me.

Thanks!
Andrew