[Eeglablist] Issues importing 32 bit neuroscan CNT files recorded in scan 4.5

[Prof. Dr. Stefan Debener]

Hi Leif,
in my old lab we used a synamps2 system and never had problems importing the 68 channel cnt files, apart from some memory issues. This was between 2006 and 2008, so we probably used an older version of neuroscan ...
Best,
Stefan


________________________________
From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] on behalf of Stephen Politzer-Ahles [politzerahless at gmail.com]
Sent: Wednesday, August 31, 2011 10:17 PM
To: Leif Oines
Cc: eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Issues importing 32 bit neuroscan CNT files recorded in scan 4.5

Leif,

I do not have an answer, but for what it's worth I have also never been able to import 32-bit .CNT files into EEGLAB (at least, not when running 32-bit Windows XP). On the other hand, I never had problems importing epoched .EEG files; therefore, my processing pipeline involves first re-referencing and epoching the data in Neuroscan (if necessary, re-referencing could be done later in EEGLAB instead) and then importing the epoched data to EEGLAB for the rest of the preprocessing.

I would also be very interested to hear about any solutions for importing the continuous data, though.

Best,
Steve Politzer-Ahles

On Tue, Aug 30, 2011 at 8:00 PM, Leif Oines <leifdoines at gmail.com<mailto:leifdoines at gmail.com>> wrote:
Hello,

I'm wondering if anyone else seems to have issues importing 32 bit neuroscan CNT files into eeglab (I've made sure that the 32 bit option is flagged when i go to read in the files). The data were recorded with a synamp2 64 channel amp. When I view the data with the eeglab plotter data from several channels do not appear at any scale, and the latencies of the channels that do display seem off in comparison to what things look like in neuroscan 4.5. There was a similar post made around 2009 but no apparent resolution. When I open epoched neuroscan EEG files, however, things seem fine. I suppose I could do all my preprocessing in neuroscan and then read in my EEG files, but I'm trying to move my entire pipeline into eeglab. Any help or even guesses would be wonderful.

Thanks,
Leif Oines

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--
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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