[Eeglablist] load EGI files

Fri Sep 12 10:15:02 PDT 2014

I run the EP toolbox on Windows 64bit.

From: eeglablist-bounces at sccn.ucsd.edu
[mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Govindan,
Rathinaswamy
Sent: Friday, September 12, 2014 4:04 AM
To: Ramón Martinez; EEGLAB List
Subject: Re: [Eeglablist] load EGI files

Dear all:

Thanks every one for all the suggestions. Here I address your questions;
also post my questions related to your suggestions.

Srini: Our sampling rate is 1KHz. I can down sample the data to 250Hz or
even lower however I am worried that it might affect the gamma band activity
that we are interested in.

Andrew: I am using IMAC to import the data. I am running 32bit MATLAB in it.
It has 16GB of RAM. I was suggested by EGI techs to insert event in the file
and use segmentation option to segment the data based on the events. After I
segmented the data, I used the convert to mat format function that came with
EGI software.  I could not able to import these mat files in MATLAB.  

Simon: I will also try your suggestion. How would I check if it has exported
the right set of electrode layout?

Iman: Are you running EP Toolbox on Windows PC or on Linux/Unix/MAC. I am
trying to understand if I need to install this in a computer running on
64bit processor.

Ramon and Alois: Does the biosig4matlab tool have to be installed on a Linux
system? Can it work on IMAC in which a 32 bit MATLAB is installed? 

I am going to try out the following:

Install EP Toolbox and check if it helps.

Install Biosig4matlab tool and check if it helps.

I will keep you posted on the status.

Thanks, again.

Best regards,

RB

R. B. Govindan, PhD  

Staff Scientist III

Director of Advanced Physiologic Signals Processing Lab

Fetal Medicine Institute

Division of Fetal and Transitional Medicine

Children's National Health System

111 Michigan Ave, NW, M3118C

Washington, DC

202-476-5309

We stand for children.

  _____  

From: Ramón Martinez [nucleuscub at gmail.com]
Sent: Thursday, September 11, 2014 3:28 PM
To: Govindan, Rathinaswamy; EEGLAB List
Subject: Re: [Eeglablist] load EGI files

Hi Govindan, 

1- From the EEGLAB side,  yes, you can import EGI files using pop_readegi.m,
but for a big file, should be better to use the Biosig plugin for EEGLAB
(you can try both)

You'll find the Biosig plugin in the EEGLAB extension manger:

 File -> Manage EEGLAB extesions -> Data import extensions

After checking out the plugin,  you can try pop_biosig.m,  or from the GUI

File -> Using the Biosig interface

2- Other memory issues can arise from the PC-MATLAB side. Check this link to
have an idea.

http://www.mathworks.com/matlabcentral/answers/91711-what-is-the-maximum-mat
rix-size-for-each-platform
<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mathworks.com_matla
bcentral_answers_91711-2Dwhat-2Dis-2Dthe-2Dmaximum-2Dmatrix-2Dsize-2Dfor-2De
ach-2Dplatform&d=AAMFaQ&c=Zoipt4Nmcnjorr_6TBHi1A&r=4JR34R10jj9uXt37C2EM4uXHW
YJdQA42rymb5F0yfJY&m=GsEjw4m_8nx3fkAo7zDVR3Ol0zIb_5r_viVtSqbdjfU&s=CLVXtTG8n
c_AkBkZXfMXanIdrUgDQWrFccevCjNUTzA&e=> 

Hope this helps,

 Ramon

On Thu, Sep 11, 2014 at 11:44 AM, Govindan, Rathinaswamy
<rgovinda at childrensnational.org <mailto:rgovinda at childrensnational.org> >
wrote:

Dear List: 

This RB Govindan from Children's Hospital, Washington, DC. We have EEG
recorded from premature infants using HD EEG system. Some of our recordings
last for more than 2 hours. We would like to export the data to MATLAB and
process them in MATLAB. The software that came with the HD EEG system is not
allowing us to convert our huge files (>2GB) into mat format. Would like to
know if there are tools available in EEGLAB or some similar to export the
data to MATLAB environment?

Thank you very much in anticipation.

Best regards,

RB Govindan

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-- 

_____________________________________________________

Ramon Martinez-Cancino

Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego

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