<br><br><div class="gmail_quote">On Wed, Jun 20, 2012 at 1:51 PM, nabaraj dahal <span dir="ltr"><<a href="mailto:nabarajdahal@gmail.com" target="_blank">nabarajdahal@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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 style><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 style><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 class="HOEnZb"><div class="h5">
<div><br><br><div class="gmail_quote">
On Wed, Jun 20, 2012 at 8:57 AM, Tom Campbell <span dir="ltr"><<a href="mailto:tom_campbell75@hotmail.com" target="_blank">tom_campbell75@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<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" target="_blank">leppert@eye-square.de</a><br>
To: <a href="mailto:smakeig@ucsd.edu" target="_blank">smakeig@ucsd.edu</a><br>CC: <a href="mailto:eeglablist@sccn.ucsd.edu" target="_blank">eeglablist@sccn.ucsd.edu</a>; <a href="mailto:smakeig@gmail.com" target="_blank">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 href="tel:19.06.2012%2000" value="+611906201200" 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" target="_blank">findjoshgold@gmail.com</a>
<span dir="ltr"><<a href="mailto:findjoshgold@gmail.com" target="_blank">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>
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<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>
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