<div dir="ltr"><div>I have had some experience loading files that looked like there was no data in the sense that everything was railed for the entire recording. We got around this by applying a 0.1Hz high-pass filter in the software tools provided by the company that built our acquisition system (EGI in our case) before loading it in EEGLAB. This immediately solved the issue, but I can't really say why (I'm not sure if the data in the EGI native file format are double-precision floats or not so I can't chalk it up to a precision issue converting double to float when large DC offsets are present). Might this be the case here?<br><br></div>Michael<br></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Aug 26, 2015 at 1:11 PM Andreas Widmann <<a href="mailto:widmann@uni-leipzig.de">widmann@uni-leipzig.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Any error messages? How do you diagnose that „there’s no data“? Please, preferably file a bug report to EEGLAB bugzilla including a sample data set (eeg + vhdr + vmrk) and code demonstrating the problem or upload the data to some file hoster and post the link to the forum.<br>
<br>
Best,<br>
Andreas<br>
<br>
> Am 25.08.2015 um 17:41 schrieb Lexie Tabachnick <<a href="mailto:ltabachnick@gmail.com" target="_blank">ltabachnick@gmail.com</a>>:<br>
><br>
> 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.<br>
><br>
> 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.<br>
><br>
> Thanks!<br>
> Lexie<br>
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