[Eeglablist] Readlocs BrainCap 128 channels (Brain Products)

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue Dec 1 10:20:39 PST 2015

Dear Klooste,

My first guess is that the scale factor is different. Some companies uses
millimeter, some others use meter. I remember one of my collaborators uses
Polhemus and the digitized channel locations came with meter unit. Try
*0.001 to convert meter to millimeter.


On Wed, Nov 18, 2015 at 12:59 AM, Klooster, D.C.W. <D.C.W.Klooster at tue.nl>

> Dear EEGlab users,
> I have created a .mat structure (containing channum, sph_theta, sph_phi
> and labels) in order to read the locations of the electrodes in the
> BrainCap with 128 channels from Brain Products. The theta and phi
> information were provided in the documentation of the cap. However, when I
> use topoplot to visualize the electrode positions, most of the electrodes
> are outside the brain and the coordinate axes seem to be changed.
> Can anybody tell me what I am doing wrong (it is not the autodetect
> problem since I tried that already...)? Or is there maybe somebody who
> wants to share whatever type of readlocs file belonging to the 128 channel
> BrainCap?
> Thank you very much.
> Kind regards,
> Debby Klooste
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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