[Eeglablist] Does EEGLAB work with EMOTIV systems

Wed Jun 20 11:19:58 PDT 2012

Hi, Looking at the header from your 2-minute emotiv measured edf into EEGLAB 11, this is what I see:
 http://imgur.com/vZjtbhttp://i.imgur.com/XDszl.png with the default filters in BESA, this looks quite like EEG, with blinks apparent:http://i.imgur.com/wZqSM.pngScrolling through, I see no saturation, which is what Alois's warning might make us worry about. There are 151 unique data values for F3 in steps of 0.512820513 in EEG.data for that channel.This compares wtith 18851 unique data values in a 2-minute channel read in from a .bdf from  a biosemi that showed smaller steps for 0.0312 with digital max at 8388607, digital min at -8388608
, physical max at 262143  and physical min at -262144  in the header. This biosemi .bdf got the same warning. I think the use of saline electrodes may be the main source of noise for the Emotiv system.  Best regards, Tom   
Date: Wed, 20 Jun 2012 15:21:18 +0930
Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems
From: nabarajdahal at gmail.com
To: tom_campbell75 at hotmail.com

Hi Tom,
Thank you for your time and effort to help with my issue.

Attached is a record of Emotiv EEG.
Best Regards,Nabaraj Dahal.

On Wed, Jun 20, 2012 at 3:07 PM, Tom Campbell <tom_campbell75 at hotmail.com> wrote:

 Hi, Please send me a short Emotiv-recorded EDF. T

Date: Wed, 20 Jun 2012 13:51:18 +0930
Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems

From: nabarajdahal at gmail.com
To: tom_campbell75 at hotmail.com

Dear Tom, I am also using emotiv system in my study.I was not able to import the EDF files in EEGlab with version 10 and version 11 with the following warning.WARNING SOPEN(EDF): Physical Max/Min values of EDF data are not necessarily defining the dynamic range.

   Hence, OVERFLOWDETECTION might not work correctly.

However, with the EEGLAB v9.0.8.6b, the import was succesful with the same warning and also a corrective not as:eeg_checkset note: upper time limit (xmax) adjusted so (xmax-xmin)*srate+1 = number of frames

I am worried whether such corrective action would twist my data.  I am importing a 2 minutes EEG data recorded from Emotiv in EDF format.
Is there anything else I can do to make the data within the range?

Best Regards,Nabaraj DahalUniversity of South Australia.

On Wed, Jun 20, 2012 at 8:57 AM, Tom Campbell <tom_campbell75 at hotmail.com> wrote:

Hi Philipp,
The Emotiv spec promises 16-bit format (an effective 14-bit precision) when 12-bit precision used to be regarded as good enough, when .edf was drawn up as 16-bit. With a dynamic range of 256mv pp that leaves what I think is a quantization error of +/- (256/(2^14))*1000 =  +/-15.625 uV pp. This may nor be a big deal and could be the least of the noise. Is there other noise (amplification, artifactal loss of contact of saline electrodes) that comes from somewhere upstream of digitization? Or is some further precision lost somehow when writing to .edf in the software that may be otherwise used in RAM and is potentially recordable? 

Best regards,
Tom.

Date: Tue, 19 Jun 2012 10:40:48 +0200
From: leppert at eye-square.de

To: smakeig at ucsd.edu
CC: eeglablist at sccn.ucsd.edu; smakeig at gmail.com

Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems

    Hi Josh,

      we imported the Emotive RawData into EEGlab before but the
      noise-ratio was not too convincing.

      I guess you are not interested in the post import of the raw-data?

      best regards

      Philipp

      Am 19.06.2012 00:23, schrieb Scott Makeig:

    Josh - 

      Re the Emotive head set: So far as I know, this is the first
      multi-channel (14 chan) wireless EEG system to be introduced at a
      (relatively) low price point.

      A group in Denmark have told us they plan to soon release open
      source software for dealing with this headset and for linking it
      to mobile phones -  I hope they may also include or make simple a
      function to import the data into EEGLAB. 

      Once their software is available, likely someone at SCCN may
      integrate an Emotiv driver into our ERICA real-time interactive
      software environment, now using LSL (lab streaming layer) software
      (soon to be documented). 

      Another group in Germany now has a report in press in which they
      attached the electronics of the Emotiv headset directly to
      standard electrodes mounted in an electrode cap, with encouraging
      results.

      There are other 16-24 channel wireless headsets including dry
      (chip) electrodes coming onto the market - whether any will be
      introduced at a low price point I don't know....

      Scott Makeig

      On Fri, Jun 15, 2012 at 3:34 PM, findjoshgold at gmail.com
        <findjoshgold at gmail.com>
        wrote:

        Hello,

          I am looking at purchasing the EMOTIV research system and
          wondering if anyone knows if EEGLAB can be used with EMOTIV
          and do they have any resources on how to get the data across. 

          Many Thanks,

          Josh Gold

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