[Eeglablist] Polhemus MATLAB code for head motion correction

[Arnaud Delorme]

Ah OK. Try this software 

http://www.nitrc.org/projects/polgui/

I have not tried it myself though.
Best,

Arno

On 20 Mar 2013, at 21:30, Catherine Chu wrote:

> Hi Arno,
> 
> We collect electrode positions one time when we place them on the
> subject for accurate positions relative to individual head shape,
> skull size, etc. We have receivers placed on eyeglasses fixed to the
> head. We collect positions at these landmarks simultaneous with each
> electrode coordinate to correct for head rotation, tilt, movement
> during the data collection process. We are looking for nonproprietary
> software to align all electrodes into a common frame, correcting for
> head translation/rotation/movement between electrode measurements.
> 
> Thanks for any help!
> Cat
> 
> 
> On Mar 20, 2013, at 10:36 AM, Arnaud Delorme <arno at ucsd.edu> wrote:
> 
>> Dear Catherine,
>> 
>> does it mean that you acquire channel positions in real time? I was not aware that this was possible with Polhemus.
>> If you do, the best solution might be to simply remove the data when the head moves. Alternatively, some ICA solution are able to remove some muscle artifacts but it is not going to be straightforward. I am not expert on the subject, maybe someone at SCCN would know better.
>> 
>> If you do not (meaning that you only acquire channel positions once), then obviously you cannot correct for head motion.
>> 
>> Best,
>> 
>> Arno
>> 
>> On 16 Mar 2013, at 09:04, Catherine Chu wrote:
>> 
>>> Hi all,
>>> 
>>> We are using a Polhemus Fasttrack machine with 2 fixed eyeglass receivers and a pen receiver to digitize EEG electrode coordinates. Does anyone have MATLAB code to correct for head motion? Any help would save us a lot of time and be greatly appreciated!
>>> 
>>> Thanks,
>>> Cat
>>> MGH, Boston
>>> cjchu at hms.harvard.edu
>>> 
>>> 
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>>