[Eeglablist] Neuroscan .cnt files

[Arnaud Delorme]

Dear Kimberly,

you may also change the EEGLAB option to use memory mapped data (which means that the data stays on disk so there is no memory limitation). Use menu item "File > Memory and other options" and check "use memory mapped".

Then import your data file (you might have to check a box to import your file in memory mapped format when you import your neuroscan file as well).

Best,

Arno

On 22 Jan 2013, at 16:12, Stephen Politzer-Ahles wrote:

> Hi Kimberly,
> 
> I've also had issues opening .cnt files even smaller (~1 GB). Do you definitely need to open the continuous data, or can you use the epoched (.eeg) data? For most of my analysis I epoch the data in Neuroscan and then import the epoched data into EEGLAB, and then usually don't get memory issues.
> 
> I've also had luck using a different computer with 64-bit Windows 7 and 8 GB of RAM. And I've heard that Unix-based OSes are much better with memory and MATLAB, although I haven't tried myself.
> 
> Best,
> Steve
> 
> On Sun, Jan 20, 2013 at 3:28 PM, Kimberly Talboom <kwingert1009 at yahoo.com> wrote:
> Good afternoon,
> 
> 
> Our laboratory's .cnt files are 3.5 GB give or take a GB depending on the research paradigm, and I am having a really difficult time getting the files to open in EEGLAB. Neuroscan can open smaller files but has also had issues exporting large data files to EEGLAB.
> 
> To attenuate the issues with RAM availability and file size, Neuroscan suggested that I:
> 
> 
> 1) Down-sample when I can
> 2) I guess there is a compiled version of EEGLAB (i.e., rather than interpreted code) that may help, but is not recommended?
> 
> 
> I can get the files to open, but it takes an hour, and then it takes another hour each time I press a button.
> 
> I am running an i7 (laptop)/ i5 (desktop), both are 64 bit 4GB RAM. I have the 64 bit version of MATLAB.
> 
> 
> If anyone has had a similar problem and has found a way around it, I would appreciate the help.
> 
> 
> 
> Thank you,
> 
> Kimberly Talboom
> 
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> 
> -- 
> Stephen Politzer-Ahles
> University of Kansas
> Linguistics Department
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