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

[Stephen Politzer-Ahles]

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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