[Eeglablist] Large data file appears empty

Stephen Politzer-Ahles spa268 at nyu.edu
Tue Aug 25 10:14:06 PDT 2015

File size should not cause an issue like this; some of my own experiments
have bigger Brain Vision files than this and I haven't had this problem.
Can you share some more information? Specifically, how you are importing
the file (what function, or what button in the GUI, you are using), and
what about the file makes it look like there's no data? You could also
consider uploading the file to Bugzilla.

My first guess is, the larger file will take longer to import, so maybe
you're just looking before the import has complete? If you're using the
GUI, the import isn't done (even though the ">>" prompt will appear in the
command window) until a few windows pop up asking for you to, e.g., name
the dataset and stuff like that; until that happens, the EEGLAB window will
look like there's no data loaded.


Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab

On Tue, Aug 25, 2015 at 7:41 PM, Lexie Tabachnick <ltabachnick at gmail.com>

> We have been running an experiment trying to collect ABR data using the
> Brainvision EP-PreAmp and Actichamp system. We ran several successful tests
> with short versions of our experiment, about 10-15 minutes of recording. We
> were able to process the data in eeglab and saw the components we were
> expecting.
> We have recently been running our full experiment, recording for about
> 45-50 minutes. The files are necessarily much bigger. The test .eeg files
> were ~150mb and the full .eeg files are ~550mb. All of our Brainvision
> equipment seems to working (amps, batteries, electrodes), and we are able
> to get our impedances low before recording. However, when we import the
> vhdr files into eeglab, it looks like there's no data there. We are
> thinking this might be an eeglab problem - perhaps the file is too large
> and something's getting lost in the import?  Any advice would be greatly
> appreciated.
> Thanks!
> Lexie
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