[Eeglablist] Reading ahdr/amrk/eeg files with eeglab

[Andreas Widmann]

Hi Arno, Giorgio,

IIRC, the ahdr/amrk indicates that the BrainVision *V-Amp* data file format is used. This is an encrypted file format we can not import. In case the files are recorded with a V-Amp system you have to load and export the data with a *unrestricted* (i.e., not VURA dongle) BrainVision Analyzer license. In case the files were recorded with a normal BrainVision Recorder/Amp, most likely the wrong (V-Amp) data format was selected (Configuration -> Select Data Storage Type, AFAIR, can check if necessary).

Best,
Andreas

Am 26.11.2013 um 06:09 schrieb Arnaud Delorme <arno at ucsd.edu>:

> Hi Andreas,
> 
> what do you think of this issue?
> Thanks,
> 
> Arno
> 
> Begin forwarded message:
> 
>> From: Giorgio De Nunzio <giorgio.denunzio at unisalento.it>
>> Subject: [Eeglablist] Reading ahdr/amrk/eeg files with eeglab
>> Date: November 15, 2013 12:47:44 AM PST
>> To: eeglablist <eeglablist at sccn.ucsd.edu>
>> 
>> Dear all,
>> I have always used eeglab for reading files saved by BrainVision 
>> (.vhdr/.vmrk/.eeg).
>> I have now files with slight different extensions: .ahdr/.amrk/.eeg. I 
>> am trying to read them with pop_loadbv() as I did with .vhdr files, but 
>> the result is strange: the eeg structure is there, with all the various 
>> fields, but when I try and visualize a data channel (e.g.: 
>> plot(eeg.data(1,:))) the waveform is nonsense and I also find some NaNs 
>> in the vector.
>> The same files are visualized correctly by BrainVision.
>> Any idea?
>> Thanks
>> Best regards
>> Giorgio
>> 
>> -- 
>> Dr. Giorgio De Nunzio
>> Dipart. di Matematica e Fisica "Ennio De Giorgi", Univ. del Salento
>> INFN Sezione di Lecce
>> ADAM (Advanced Data Analysis in Medicine) srl
>> Lecce (Italy)
>> giorgio.denunzio at unisalento.it
>> giorgio.denunzio at adamgroup.it
>> tel +39 0832 297084-297051
>> fax +39 0832 297100
>> mobile +39 320 3829845
>> 
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