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

[Baris Demiral]

To update your records: I am using 64-bit MATLAB on both Windows 7 and
Ubuntu 64-bit with large enough memory of 24GB.

I can easily import the 32-bit CNT files including the neuroscan
key-button presses -recorded by Scan 4.3-. We record in AC mode with
High-Pass filter of 0.05Hz, and low-pass filter of 100Hz with a 500Hz
sampling-rate. I assume your problem is the DC-offset or issues
importing with with 32-bit matlab (?).

Interestingly, I raised this issue two months ago in this list, when
you use GUI to import the cnt file usinf the bio-sig function, this
operation does not give any error messages. If you write the same
command in the command window or the script, bio-sig function gives
you an error message but things still progress.

Have you ever suceed in running Scan 4.5 on an XP machine? We get an
error all the time, and still run 4.3 version. If you have any
information on that could you please let me know?

Best,
Baris

On Sat, Sep 10, 2011 at 9:21 PM, Stephen Politzer-Ahles
<politzerahless at gmail.com> wrote:
> Hello everyone,
>
> I just succeeded in loading a pretty large .cnt file (32-bit, from Scan 4.3,
> Synamps 2 amplifier) using eeglab9_0_7_6b on a 64-bit Windows 7 system. In
> the past I wasn't able to load even small .cnt files, but that was using a
> different system (32-bit Windows XP). I haven't had an opportunity to try it
> with other systems so I don't know if the key is having 64-bit MATLAB versus
> 32-bit, or having Windows 7 versus Windows XP. (I've also heard that running
> EEGLAB in Unix doesn't run into most of these memory problems.)
>
> Best,
> Steve Politzer-Ahles
>
>
> On Thu, Sep 1, 2011 at 10:09 PM, John Curtin <jjcurtin at wisc.edu> wrote:
>>
>> For the record, we have had no problems importing Neuroscan cnt files with
>> various hardware versions (synamps, synamps 2, synamps rt; 16 bit and 32
>> bit).  We use 64 bit matlab to avoid memory issues in wndows.  We use XP and
>> Windows 7.
>> John J. Curtin, Ph.D.
>> Professor of Psychology
>> Director of Clinical Training, and
>> Associate Chair of Graduate Studies
>> University of Wisconsin
>> 1202 West Johnson St.
>> Madison, WI 53706
>>
>> Email: jjcurtin at wisc.edu
>> Website: http://dionysus.psych.wisc.edu
>> Office: 608-262-0387
>> Lab: 608-262-5621
>> Cell: 608-217-6221
>> Fax: 608-262-4029
>>
>>
>>
>> On Thu, Sep 1, 2011 at 11:06 AM, Prof. Dr. Stefan Debener
>> <stefan.debener at uni-oldenburg.de> wrote:
>>>
>>> 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
>>>>
>>>> _______________________________________________
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>>>
>>>
>>>
>>>
>>> --
>>> Stephen Politzer-Ahles
>>> University of Kansas
>>> Linguistics Department
>>> http://www.linguistics.ku.edu/
>>>
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>>
>
>
>
> --
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
> http://www.linguistics.ku.edu/
>
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-- 
Ş. Barış Demiral, PhD.
Department of Psychiatry
Washington University
School of Medicine
660 S. Euclid Avenue
Box 8134
Saint Louis, MO 63110
Phone: +1 (314) 7477 1603