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ucdavis / erplab

ERPLAB Toolbox is a free, open-source Matlab package for analyzing ERP data. It is tightly integrated with EEGLAB Toolbox, extending EEGLAB’s capabilities to provide robust, industrial-strength tools for ERP processing, visualization, and analysis. A graphical user interface makes it easy for beginners to learn, and Matlab scripting provides enormous power for intermediate and advanced users.
http://erpinfo.org/erplab
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ERPLAB channel operations collide with EEGLAB channel locations #127

Open leehep200286 opened 4 years ago

leehep200286 commented 4 years ago

When I re-reference channels using ERPLAB, it erases the channel locations in EEGLAB. Then, I am unable to perform ICA and inspect components by map. Am I doing something wrong?

Thank you!!

(latest versions of both EEGLAB and ERPLAB, Windows 10 64bit)

ammsimmons commented 4 years ago

This is not a fix, but you could just re-add the channel locations prior to ICA (if you have the same location file). Therefore, I usually always add the channel locations at the end of processing before ICA. ICA will run, and then you will be able to inspect component maps.

andrewxstewart commented 4 years ago

If the properties of the channels are modified through Channel Operations, it is possible that the location information can become obsolete. This is why Channel Operations sometimes removes channel information, so as to avoid incorrect locations.

If you are just re-referencing in the Channel Operations window, you can use a tickbox in the GUI, that says "Try to preserve location info". With this selected, and the number of channels is exactly the same before and after the operation, then the location info should be kept.