[Eeglablist] Channel Number After Interpolation

Nilo Sarraf nilo.sarraf at yahoo.com
Mon Nov 29 09:15:38 PST 2021

Hi Bennett, 
I don’t know about your study but when I was doing mine I had to create a CED file manually to make sure all of the sensors locations and channel  numbers matched. This is because I used EMOTIV EPOC headset which has 14 channels. 
The normal automated CED file didn’t cut it because I got an extra channel on the list it generated and as a result the channel numbers, coordinates, and names/labels didn’t match. But when I created it manually it worked great. 
How this helped!Dr. Nilo Sarraf

Sent from Yahoo Mail for iPhone

On Monday, November 29, 2021, 9:01 AM, Alterman, Bennett L via eeglablist <eeglablist at sccn.ucsd.edu> wrote:


When I interpolate a channel using "Use specific channels of other dataset", the new channel number is added to the end of the channels. For example FP1 is my first channel (FPZ is channel 2), but if I remove it and then interpolate it later, it is listed as channel 58, and FPZ becomes channel 1 and the rest of the data are all shifted one channel number. When I plot the channels, they are all in the correct position on the head because it is still correctly mapped to my chanlocs file. So the head map starts with 58, then 1-57 for the remaining channels.

Is this a problem for creating my study? Or is it fine because the channels are mapped by the label (i.e., "FP1") rather than the channel number (i.e., 58)? I just want to make sure that I am not mapping channel 58 to channel 58, but am mapping FP1 to FP1 between datasets.

Bennett Alterman, M.S.

Ph.D. Candidate, Cognitive Motor Control Laboratory
School of Biological Sciences
Georgia Institute of Technology
bennett.alterman at gatech.edu
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