[Eeglablist] BESA .fsg files

Deborah Apthorp deborah.apthorp at anu.edu.au
Tue May 23 19:17:10 PDT 2017

Dear EEGlab list,

I’m trying to work with some files from BESA software that a colleague needs plotted in a specific way. What I really want it just to get the numbers into MATLAB so I can write a nice script to plot them. However, these files are .fsg files, and I CANNOT find any easy way to import them.

I have managed (at some length) to get hold of a BESA license and have tried to export the files in as many ways as possible. Not one of these seems easily importable into either EEGlab or MATLAB. The closest has been the elf format, but this does not import well - it imports the data but not the 5 conditions.

The files have 33 channels with the averages for 5 different conditions. In the dataset these seem to be appended (so the data format is 33x10752 which I presume is all 5 events end-to-end).

Any hints would be gratefully accepted.



Dr. Deborah Apthorp
deborah.apthorp at anu.edu.au<mailto:deborah.apthorp at anu.edu.au>
NHMRC Early Career Research Fellow
Research School of Psychology
Research School of Computer Science

ph. +61 412 441 123

On 20 May 2017, at 4:49 am, Tarik S Bel-Bahar <tarikbelbahar at gmail.com<mailto:tarikbelbahar at gmail.com>> wrote:

Hello Maria, quick note below. Best wishes.


Yes this should generally work in eeglab. Just properly create a study with your "only" 2 datasets.
Then compute/view plots of the differences between these two conditions.
Note there are also mutliple plugins (e.g. LIMO EEG) and an upcoming STUDY update that may be useful.

Alternatively, you should be able to subtract one set of data from the other,
and then feed the differenced data to the eeglab function of your choice.
This would be in a script, where you have two EEG.data structures.
Then you should end up with one new EEG.data structure that is the difference.
You have to determine how the difference is computed, channel-wise, time-wise, ERPs or continuous, etc...

You can also find previous answers on similar topics by googling eeglablist and your topic (e.g., difference, difference waves, difference topomap, etc..).

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