[FieldTrip] a question about EEG layout

Stanley A. KLEIN sklein at berkeley.edu
Wed Feb 16 19:22:28 CET 2022

Ahh such wonderful memories,
As I recall we had more than 200 electrodes on the scalp and we used that
information to localize the multiple sources of the EEG. We then did our
best to find the location and direction of each source.
It was a wonderful challenge for me.


On Wed, Feb 16, 2022 at 9:53 AM Schoffelen, J.M. (Jan Mathijs) via
fieldtrip <fieldtrip at science.ru.nl> wrote:

> Hi Masoud,
> Could you provide a little bit more information? In your first method:
> what is the exact error that you get? Have you inspected the output to
> ft_prepare_layout, after you clicked all electrodes?
> I assume that the error you encounter is the one that is thrown in line
> 535 or 543 of ft_prepare_layout. This suggests that the mat-file you are
> reading does not contain a variable that is called ‘lay’ or ‘layout’.
> Best wishes,
> Jan-Mathijs
> > On 14 Feb 2022, at 16:37, masoud via fieldtrip <fieldtrip at science.ru.nl>
> wrote:
> >
> > Hello, I am currently using the fieldtrip matlab toolbox for
> preprocessing an EEG dataset,  and I have a problem while making a layout.
> I used two methods for making the layout.
> > 1- I used a picture with markers for each electrode and I specified the
> outline and mask with ft-prepare-layout. but when I wanted to use the
> layout it simply said as an error:(mat file does not contain a layout).
> > 2- I use an standard template that has more channel number than my
> dataset, so i used the desired electrode to make a structure with label,
> pos, width and height but still when I used ft-prepare-layout, I got the
> same error as the first method
> > would you mind please helping me with this problem?
> > thank you so much for your attention and your amazing toolbox
> > sincerely, Masoud
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