importing CeeGraph EEG data in Fieldtrip & iEEG analysis

[Michiel van Elk]

Dear Fieldtrippers,

Recently I acquired iEEG data with a BioLogic CeeGraph system which
generates a single file with an '.eeg' extension. It took me quite
some time to figure out how to read in the data in a format that is
usable in Fieldtrip, so here is the trick for anyone interested:

The latest version of Cartool software is the only software I found
that is capable of reading in the CeeGraph data
(http://cartoolcommunity.unige.ch/). Next, the individual tracks can
be exported in an 'eph'-format. This takes quite some time and
generates 3 separate files:

- an '.eph' file: which is a tab-separated text file with the
dimensions [nr_samples x nr_ electrodes]
- a '.mrk' file: containing the markers and the corresponding samples
- a '.vrb' file: giving a summary of the conversion process.

The first two files can be relatively easily imported in Matlab using
custom-made scripts and transformed in a format that Fieldtrip likes:)

In addition I was wondering if anyone knows about the right filter
settings for preprocessing iEEG data for LFP and TFR analysis? In the
literature I could not find a 'gold standard' and people from
different groups are doing different things. Any help would be greatly
appreciated!

Best,
Michiel van Elk

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