Back to PLS HelpPosted on 11/18/14 15:27:05
Number of posts: 3
Hi, I am having some issues changing one of the pre-set electrode location files. As suggested under the FAQ section, I am attempting to change the file "erp_loc_besa148.mat" to instead reflect our standard 10/20 64-channel biosemi ActiveTwo system. I have the electrode names and x, y coordinates, but I'm unsure how to actually change and save the channel names. I opened the "chan_nam" file in Matlab, but there doesn't seem to be any option to edit this file. Any assistance would be greatly appreciated.
Thanks in advance,
John
Replies:
I'm Online
Posted on 11/19/14 14:26:20
Number of posts: 229
You can do one of two things.
1) Since you are using the 10/20 system, the electrode names/approximate locations should match the BESA/BESAThetaPhi locations. Once your subjects are selected, select "EditChannelOrder" and you should see a list of electrode names - select each one, in the order they appear in your datafile. (Figure 6 in the user guide).
(If you'd rather not select them by hand, you can load erp_loc_besa148.txt into an editor, and save a text file with the channels you need (in the order you need). Note: save only the electrode "number" in the last column. Then in "EditChannelOrder" select File>LoadFromTextFile. )
2) Make your own layout - this is described in the PLS help, just after figure 6.
Nancy
Posted on 11/20/14 17:20:09
Number of posts: 3
Great! Thanks Nancy, I just tried making the new text file and it works great. Much appreciated.
John
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