[FieldTrip] Reading in .bdf files

[Raquel Bibi]

Hi Ricarda,
The Biosemi system uses CMS & DRL during acquisition as the common mode for
the ground electrode.   Are you re-referencing your EEG signals, before
viewing them in ft_databrowser?

Best,

Raquel

On Mon, Sep 22, 2014 at 10:43 AM, Ricarda Braukmann <
r.braukmann at donders.ru.nl> wrote:

> Hi everyone,
>
>
> I have a question regarding reading in Biosemi .bdf files.
>
>
> I followed the example on the ft website to read in a .bdf file, and -
> although it does not give an error- , the data looks very odd. In the
> ft_databrowser for example the vertical scale is [ -178000  178000 ]
> which seems very werid to me.
>
>
> I  tried re-referencing the data, like in the example, using channel
> 'EXG5', but this did not help.
>
>
> Is there anyone who has experience with reading in biosemi files who could
> give me some advice?
>
> It would also be great if someone could explain to me what these EXG
> channels are exactly.
>
>
> I have for now turned to converting the .bdf file to .edf file (using the
> converter from www.biosemi.com/download/
> <http://www.biosemi.com/download/ToolsForRuntimeEngine861/Converter86.zip>).
> Then the data looks normal, but it created some other issues with my
> markers and I would rather not use the converted files.
>
> More than anything, I am very curious what is going on with the original
> file, so any help is much appreciated!
>
>
> Thanks in advance!
>
> Ricarda
>
>
> --
>
> Ricarda Braukmann, MSc
> PhD student
>
>
> Radboud University Medical Centre & Baby Research Center
>
> Donders Institute for Brain, Cognition and Behaviour,
> Centre for Neuroscience & Centre for Cognition
>
> Room B.01.22
> Phone: +31 (0) 24 36 12652
> Email: r.braukmann at donders.ru.nl
>
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