[Eeglablist] Standard channel location (including theta, sph_phi, sph_radius) for 128 non-hydrocel nets

[Jody Zhou]

Dear all,

We read GSN.129.sfp file in our 128 non-hydrocel montage as the channel
location in EEGlab through FILE-IO interface.

 The E129 ( Cz), however, is missing its channel location information while
every electrode else has full locations.  See picture:
https://www.dropbox.com/s/5w6dtech99htu4a/MissingLocationInE129.PNG?dl=0

We are wondering if anyone could help us with this issue. We are thinking
of manually input a standard location for the Cz, but the GSN.129.sfp only
provides us with X,Y,Z coordinates, but EP Tool kit (where we plan to
detect artifacts) needs all information of E129 ( not just X, Y, Z, but
also ta, sph_phi, sph_radius). But we have none information of that. Does
anyone know where and how to get the standard location for Cz.  Our age
group is 3-5 years old if that matters.  Thank you so much!

Here is the GSN.129.sfp we use to read in as channel location:
https://www.dropbox.com/s/lypgjdbf7ej0oll/GSN129%20%281%29.sfp.txt?dl=0


Best
Jody
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