Electrode proximity/distance
Posted: Mon May 06, 2013 12:56 pm
Hello,
is there a handy index available to read out the distances between electrodes in the Biosemi caps? For instance, I have data from the Biosemi 128 cap, with A1-32, B1-32, C1-32, D1-32 electrodes. If I want to define a region of interest in Matlab, I must select specific sets of electrodes because labels which are adjacent in number are often NOT adjacent in topography and vice versa, e.g. A8-12 is adjacent to D29-32. A1 is adjacent to A2, B1, C1, D1 and D15. And it can be quite arbitrary to decide what is adjacent and what not, a better solution would be to just define a radius within which all electrodes are included.
Thus it would be really handy to have a table giving the distance between every pair of electrodes, so that one could iterate through all electrodes and for each one, easily pick all adjacent electrodes, or electrodes within X mm, etc.
Any body have any promising leads?
is there a handy index available to read out the distances between electrodes in the Biosemi caps? For instance, I have data from the Biosemi 128 cap, with A1-32, B1-32, C1-32, D1-32 electrodes. If I want to define a region of interest in Matlab, I must select specific sets of electrodes because labels which are adjacent in number are often NOT adjacent in topography and vice versa, e.g. A8-12 is adjacent to D29-32. A1 is adjacent to A2, B1, C1, D1 and D15. And it can be quite arbitrary to decide what is adjacent and what not, a better solution would be to just define a radius within which all electrodes are included.
Thus it would be really handy to have a table giving the distance between every pair of electrodes, so that one could iterate through all electrodes and for each one, easily pick all adjacent electrodes, or electrodes within X mm, etc.
Any body have any promising leads?