[Eeglablist] Importing data from Brain Vision Analyzer

[Suzan Tokac (HDR)]

Dear Katya,

I also worked with the same data on BVA and on MATLAB using EEGLAB. When you preprocess .vhdr you do not manipulate the raw data but generate a separate file. On MATLAB I use a code line to be able to work with .vhdr :

rmpath('/fieldtriplite')
delete('._*')
eegs = dir('*.vhdr');

and I do the rest of the preprocessing with a script. I am not sure if this is useful but I am sharing it in case.


________________________________
From: eeglablist <eeglablist-bounces at sccn.ucsd.edu> on behalf of Katarzyna Dudzikowska <k.a.dudzikowska at gmail.com>
Sent: Thursday, 25 June 2020 9:42 PM
To: eeglablist at sccn.ucsd.edu <eeglablist at sccn.ucsd.edu>
Subject: [Eeglablist] Importing data from Brain Vision Analyzer

Dear all,

I am about to embark on my very first EEG data analysis project. I received
data from my supervisor who works with Brain Vision Analyzer, I have .eeg,
.vmrk and .vhdr files. I understand that .eeg is the actual recording,
.vmrk contains information about the events and .vhdr is the metadata file
that I have successfully used to import the datasets into EEGLAB using
the bva-io plugin.

My problem is that I simply do not know whether the data I have includes
any preprocessing steps or not, or how I can tell. Would .eeg data in
principle be raw data? Or is it possible that it does already include some
artifact rejection and/or channel interpolation that has been performed on
this dataset in Brain Vision Analyser? Is there any way to figure it out
from the data itself? It imports as a single, continuous epoch.

Originally I was meant to work with already preprocessed data, but it seems
that I have to carry it out somewhat differently for my research goals. Can
I safely undertake my own preprocessing steps on the data as I have it?

I'd be very grateful for some help figuring this out.

Best,
Katia
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