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

[Yvonne Tran]

Hi Leif

I think it is the DC offset. If you want to display your signal, in the plot there is the Display tab, choose remove DC offset. If you wish to remove the problem, then filtering the dataset with a highpass filter of 1Hz generally gets rid of the offset.

Hope this works for you,
Regards,
Yvonne



----- Original Message -----
From: "Prof. Dr. Stefan Debener" <stefan.debener at uni-oldenburg.de>
Date: Friday, September 2, 2011 3:37 am
Subject: Re: [Eeglablist] Issues importing 32 bit neuroscan CNT files recorded in scan 4.5
To: Stephen Politzer-Ahles <politzerahless at gmail.com>, Leif Oines <leifdoines at gmail.com>
Cc: "eeglablist at sccn.ucsd.edu" <eeglablist at sccn.ucsd.edu>


> 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< 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
>  
>  _______________________________________________
>  Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>  To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu<
>  For digest mode, send an email with the subject "set digest mime" to 
> eeglablist-request at sccn.ucsd.edu<
>  
>  
>  
>  --
>  Stephen Politzer-Ahles
>  University of Kansas
>  Linguistics Department
>  http://www.linguistics.ku.edu/
>  
> _______________________________________________
>  Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
>  To unsubscribe, send an empty email to eeglablist-unsubscribe at sccn.ucsd.edu
>  For digest mode, send an email with the subject "set digest mime" to 
> eeglablist-request at sccn.ucsd.edu

UTS CRICOS Provider Code: 00099F
DISCLAIMER: This email message and any accompanying attachments may contain confidential information.
If you are not the intended recipient, do not read, use, disseminate, distribute or copy this message or
attachments. If you have received this message in error, please notify the sender immediately and delete
this message. Any views expressed in this message are those of the individual sender, except where the
sender expressly, and with authority, states them to be the views of the University of Technology Sydney.
Before opening any attachments, please check them for viruses and defects.

Think. Green. Do.

Please consider the environment before printing this email.