[Eeglablist] Question about channel locations for Biopac EDA dat

[James Jones-Rounds]

>>  It might be helpful to note that even before putting in the event info,
I am not able to plot the wave in EEGLAB.

Does that mean the plotting function doesn't even put a window on the
screen, or spits out an error to the MATLAB command window, when you go to
"Plot > Channel data (scroll)" ?

Or do you mean that when you do plot the data, you can't see any wave forms
in the plotting window?

If it's just that you don't see any wave forms in the plotting window, that
might be because of the y-axis range, or a related "offset" issue. On the
plot figure menu, try clicking "Display > Remove DC Offset". That might
re-center your plotting window onto the data wave-form. Then you can play
around with the y-axis range on the bottom right text-input box, that has
the "+" and "-"  next to it.

On Tue, Apr 25, 2017 at 12:39 PM, Emily Cohodes <emily.cohodes at yale.edu>
wrote:

> 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 <(607)%20255-9883>
> eeg at cornell.edu
>
>
>


-- 
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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