[Eeglablist] Question about channel locations for Biopac EDA dat

[Emily Cohodes]

Hi James,

Thanks for your quick reply! I’m glad to hear that channel location info is not necessary and that there must be an issue with how I’m formatting either the wave or event files. 

I have imported the BIOPAC-specific data import extension for EEGLAB and am exporting my data from Acqknowledge in a “.mat” format. It might be helpful to note that even before putting in the event info, I am not able to plot the wave in EEGLAB. 

Any further thoughts you may have/suggestions for troubleshooting would be very much appreciated!

Best,
Emily
__________________
Emily Cohodes
PhD Student, Clinical Psychology
Clinical Affective Neuroscience and Development Lab
Yale University
2 Hillhouse Avenue
New Haven, CT 06520

> On Apr 25, 2017, at 8:32 AM, James Jones-Rounds <jj324 at cornell.edu> wrote:
> 
> Hi Emily,
> 
> If you have successfully imported your data file from Acqknowledge into EEGLAB, then you should be able to plot the data from the EDA channel (you're referring to skin conductance, right?) regardless of whether you have channel location data. This is the same for any data imported to EEGLAB. Some topographic-related functions (like plotting a scalp map) require channel locations, and most advanced functionalities in the data do too. But just plotting the time series data does not require that. 
> 
> I suspect, however, that the data is not being imported properly. Have you installed the BIOPAC-specific data import extension for EEGLAB? If so, you might see that it expects the BIOPAC data to be in a ".mat" format, which you can save your .acq files in if you do "Save as" in Acqknowledge.
> 
> Or do you mean that your events aren't showing up in the time-series plot? In that case I think you should double-check that the event matrix that you're feeding into the "pop_importevent" is formatted correctly. If you're using the "pop_chanevent" function instead, because you have a BIOPAC channel that was functioning as your stimulus event code channel, then try playing with the settings of that function to make sure it's importing your events properly. Good luck!
> 
> James
> 
> 
> ---------- Forwarded message ----------
> From: Emily Cohodes <emily.cohodes at yale.edu>
> To: <eeglablist at sccn.ucsd.edu>
> Cc: 
> Bcc: 
> Date: Fri, 21 Apr 2017 07:51:06 -0400
> Subject: [Eeglablist] Question about channel locations for Biopac EDA data
> Hi eeglablist, 
> 
> I am trying to batch enter event markers for an EDA file (collected using Biopac/AcqKnowledge) that I have exported into eeglab. Currently, the file is reading in the events but is not able to plot It either in eeglab or when I export it back to AcqKnowledge. I am guessing that I need to read in channel locations in order for it to plot. Does anyone know where I can find the correct channel locations for EDA data collected with Biopac to use in eeglab or how to set this up? 
> 
> Thanks in advance for your help!
> 
> Best,
> Emily
> __________________
> Emily Cohodes
> PhD Student, Clinical Psychology
> Clinical Affective Neuroscience and Development Lab
> Yale University
> 2 Hillhouse Avenue
> New Haven, CT 06520
> -- 
> James Jones-Rounds
> Laboratory Manager
> Human Development EEG and Psychophysiology (HEP) Laboratory,
> Department of Human Development,
> --------------------------------------------
> Cornell University | Ithaca, NY
> 607-255-9883
> eeg at cornell.edu

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