<html>
<head>
<style><!--
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Tahoma
}
--></style></head>
<body class='hmmessage'><div dir='ltr'>
Hi,<div> </div>Looking at the header from your 2-minute emotiv measured edf into EEGLAB 11, this is what I see:<br> <p><a href="http://imgur.com/vZjtb">http://imgur.com/vZjtb</a><BR><a href="http://i.imgur.com/XDszl.png">http://i.imgur.com/XDszl.png</a><BR> <BR>with the default filters in BESA, this looks quite like EEG, with blinks apparent:<BR><a href="http://i.imgur.com/wZqSM.png">http://i.imgur.com/wZqSM.png</a><BR><div><div id="SkyDrivePlaceholder">Scrolling through, I see no saturation, which is what Alois's warning might make us worry about.</div><div> </div><div>There are 151 unique data values for F3 in steps of 0.512820513 in EEG.data for that channel.</div><div>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<br>, physical max at 262143 and physical min at -262144 in the header. This biosemi .bdf got the same warning.</div><div> </div><div>I think the use of saline electrodes may be the main source of noise for the Emotiv system. </div><div> </div><div>Best regards,</div><div> </div><div>Tom</div><div> </div><div> </div><div> <br></div><hr id="stopSpelling">Date: Wed, 20 Jun 2012 15:21:18 +0930<br>Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems<br>From: nabarajdahal@gmail.com<br>To: tom_campbell75@hotmail.com<br><br>Hi Tom,<div><br></div><div>Thank you for your time and effort to help with my issue.<br><div><br></div><div>Attached is a record of Emotiv EEG.</div><div><br></div><div>Best Regards,</div><div>Nabaraj Dahal.</div><div><br>
</div><div><br><br><div class="ecxgmail_quote">On Wed, Jun 20, 2012 at 3:07 PM, Tom Campbell <span dir="ltr"><<a href="mailto:tom_campbell75@hotmail.com">tom_campbell75@hotmail.com</a>></span> wrote:<br>
<blockquote style="padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="ecxgmail_quote">
<div><div dir="ltr">
<br><br><div> Hi, Please send me a short Emotiv-recorded EDF. T</div><br> <br><BR><div><div></div><hr>Date: Wed, 20 Jun 2012 13:51:18 +0930<div class="ecxim"><br>Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems<br>
</div>From: <a href="mailto:nabarajdahal@gmail.com">nabarajdahal@gmail.com</a><br>To: <a href="mailto:tom_campbell75@hotmail.com">tom_campbell75@hotmail.com</a><div><div class="h5"><br><br>
Dear Tom, <div>I am also using emotiv system in my study.</div><div>I was not able to import the EDF files in EEGlab with version 10 and version 11 with the following warning.</div><div><div><span><font color="#ff0000">WARNING SOPEN(EDF): Physical Max/Min values of EDF data are not necessarily defining the dynamic range.</font></span></div>
<div><span><font color="#ff0000"> Hence, OVERFLOWDETECTION might not work correctly.</font></span></div></div><div><font color="#ff0000"><br>
</font></div><div>However, with the EEGLAB v9.0.8.6b, the import was succesful with the same warning and also a corrective not as:</div><div><font color="#ff0000">eeg_checkset note: upper time limit (xmax) adjusted so (xmax-xmin)*srate+1 = number of frames</font></div>
<div><font color="#ff0000"><br></font></div><div>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.</div><div>
Is there anything else I can do to make the data within the range?</div><div><br></div><div><br></div><div>Best Regards,</div><div>Nabaraj Dahal</div><div>University of South Australia.</div><div><br><br><div>
On Wed, Jun 20, 2012 at 8:57 AM, Tom Campbell <span dir="ltr"><<a href="mailto:tom_campbell75@hotmail.com">tom_campbell75@hotmail.com</a>></span> wrote:<br><blockquote style="padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">
<div><div dir="ltr">
<div dir="ltr">Hi Philipp,<br></div><div dir="ltr">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? <br>
<br>Best regards,<br>Tom.<br><br></div><div dir="ltr"> </div><div dir="ltr"><br> <br></div><div dir="ltr"><div></div><hr>Date: Tue, 19 Jun 2012 10:40:48 +0200<br>From: <a href="mailto:leppert@eye-square.de">leppert@eye-square.de</a><br>
To: <a href="mailto:smakeig@ucsd.edu">smakeig@ucsd.edu</a><br>CC: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a>; <a href="mailto:smakeig@gmail.com">smakeig@gmail.com</a><br>
Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems<div><div><br><br>
<div>Hi Josh,<br>
<br>
we imported the Emotive RawData into EEGlab before but the
noise-ratio was not too convincing.<br>
I guess you are not interested in the post import of the raw-data?<br>
<br>
best regards<br>
Philipp<br>
<br>
<br>
Am <a target="_blank">19.06.2012 00</a>:23, schrieb Scott Makeig:<br>
</div>
<blockquote>Josh - <br>
<br>
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.<br>
<br>
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. <br>
<br>
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). <br>
<br>
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.<br>
<br>
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....<br>
<br>
Scott Makeig<br>
<br>
<br>
<br>
<div>On Fri, Jun 15, 2012 at 3:34 PM, <a href="mailto:findjoshgold@gmail.com">findjoshgold@gmail.com</a>
<span dir="ltr"><<a href="mailto:findjoshgold@gmail.com">findjoshgold@gmail.com</a>></span>
wrote:<br>
<blockquote style="padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;">Hello,<br>
<br>
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.
<div>
<br>
</div>
<div>Many Thanks,</div>
<div> </div>
<div>Josh Gold</div>
<br>
_______________________________________________<br>
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" target="_blank">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>
For digest mode, send an email with the subject "set digest
mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a><br>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation;
Prof. of Neurosciences (Adj.), University of California San Diego,
La Jolla CA 92093-0559, <a href="http://sccn.ucsd.edu/~scott" target="_blank">http://sccn.ucsd.edu/~scott</a><br>
<br>
<fieldset></fieldset>
<br>
<pre>_______________________________________________
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" target="_blank">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a></pre>
</blockquote>
<br>
<br>
<pre>--
........................................................................
... PHILIPP LEPPERT
Director Planning
... eye square GmbH
Schlesische Str. 29-30 (F)
D-10997 Berlin
Germany
... Fon <a target="_blank">+49 30 698144-22</a>
Fax <a target="_blank">+49 30 698144-10</a>
... <a href="http://www.eye-square.com" target="_blank">http://www.eye-square.com</a>
<a href="mailto:leppert@eye-square.com">leppert@eye-square.com</a>
........................................................................
Geschaeftsfuehrer/Managing Partner: Michael Schiessl
Steuernummer/Tax No.: 29/506/02764
USt.Id.Nr./VAT No.: DE210454419
Registergericht/Court of Registry: Charlottenburg HRB 76686
</pre>
<br>_______________________________________________
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" target="_blank">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a></div></div></div>
</div></div>
<br>_______________________________________________<br>
Eeglablist page: <a href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" target="_blank">http://sccn.ucsd.edu/eeglab/eeglabmail.html</a><br>
To unsubscribe, send an empty email to <a href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</a><br>
For digest mode, send an email with the subject "set digest mime" to <a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a><br></blockquote></div><br></div></div>
</div></div> <BR></div></div>
</blockquote></div><br></div></div></div> </div></body>
</html>