<div dir="ltr"><div>Dear all,</div>
<div> </div>
<div>I have my own data set for emotion recognition using EEG signals. In my data </div>
<div>acquistion system, i have followed to extract the data in "Average-64" method.</div>
<div>I also have an option to select "Current Montage" data. </div>
<div> </div>
<div>1. Now my doubt is what is the difference between "Average- 64" and Current </div>
<div> Montage. Which one is effcetive one for analysing the EEG signal.</div>
<div>2. I am used Butterworth filtering and Average Mean Reference method for removing </div>
<div> the noises and artifacts.Will it be enough for removing noises and artifacts effectively?</div>
<div>3. I started my experiment once i confirmed the Impedance of all eelctrodes will come</div>
<div> below the thresold value (> 10 Kilo Ohm). However, when the subject move some</div>
<div> have in randam manner during my experiment means, i faced to have some electrodes</div>
<div> which is haveing the impedance above the thresold value. Is there any significance of</div>
<div> this impedance variation in EEG signals for getting an effective one ?</div>
<div>4. For my experiment, What is the number of minimum subjects is required to validate </div>
<div> my results. Some of them are telling that, 100 0r 200 subjects. But its quite impossible</div>
<div> for me. According to the universal statistics, what is minimum no of subjects required </div>
<div> to validate the results?</div>
<div> </div>
<div>Pl kindly reply to my quires. Hope my questions not only benifit for myself also for others.</div>
<div> </div>
<div>Thanks in advance.</div>
<div> </div>
<div> M Murugappan.<br><br></div>
<div class="gmail_quote">2008/9/7 <span dir="ltr"><<a href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</a>></span><br>
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<br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of eeglablist digest..."<br><br>Today's Topics:<br><br> 1. FFT in EEG signal (Mohd Naz)<br> 2. advice on exporting to cartool (Hamish Innes-Brown)<br>
3. Re: FFT in EEG signal (arno delorme)<br> 4. What would be the best way to determine dipole locations for<br> P300 responses? (Fuh-Cherng Jeng)<br> 5. Re: EEGLAB&FastICA (Arnaud Delorme)<br><br><br>---------- Forwarded message ----------<br>
From: Mohd Naz <<a href="mailto:starz_naz@yahoo.com">starz_naz@yahoo.com</a>><br>To: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br>Date: Sun, 31 Aug 2008 12:05:35 +0800 (SGT)<br>Subject: [Eeglablist] FFT in EEG signal<br>
<table cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td valign="top">if i want to know frequency content in eeg signal recorded for 30 minutes, could i make use FFT?<br></td></tr></tbody></table><br>
<hr size="1">
Yahoo! Toolbar kini dikuasa dengan Search Assist. <a href="http://mys.rd.yahoo.com/search/toolbar/mail/signature/*http://malaysia.toolbar.yahoo.com/" target="_blank">Muat turunnya sekarang.</a><br><br>---------- Forwarded message ----------<br>
From: Hamish Innes-Brown <<a href="mailto:hinnesbrown@gmail.com">hinnesbrown@gmail.com</a>><br>To: EEGLab List <<a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a>><br>Date: Wed, 3 Sep 2008 17:36:39 +1000<br>
Subject: [Eeglablist] advice on exporting to cartool<br>
<div style="WORD-WRAP: break-word">Hi there, I'm writing to the list to see if anyone has any advice on how best to export data from EEGLAB to Cartool...
<div><br></div>
<div><a href="http://brainmapping.unige.ch/Cartool.htm" target="_blank">http://brainmapping.unige.ch/Cartool.htm</a><br>
<div><br></div>
<div>I have the data in a variety of forms in EEGLAB - continuous, epoched and averaged. The best thing (I think) would be to export the continuous data in a format that Cartool can read, preferably a format that contains all the event onformation as well, like neuroscan .EEG (this is just one I know) or EDF.</div>
<div><br></div>
<div>I looked into it a bit, and discovered the Biosig toolbox distributed with EEGlab can read and write EDF, using the "ssave()" command. </div>
<div><br></div>
<div>
<blockquote type="cite">
<div><font color="#000000">help ssave</font></div>
<div><font color="#000000"> SSAVE saves signal data in various data formats</font></div>
<div><font color="#000000"> </font></div>
<div><font color="#000000"> Currently are the following data formats supported: </font></div>
<div><font color="#000000"> EDF, BDF, GDF, BKR, SND/AU, (WAV, AIF)</font></div>
<div><font color="#000000"> and WSCORE event file</font></div>
<div><font color="#000000"> </font></div>
<div><font color="#000000"> HDR = ssave(HDR,data);</font></div>
<div><font color="#000000"> HDR = ssave(FILENAME,data,TYPE,Fs);</font></div>
<div><font color="#000000"> </font></div>
<div><font color="#000000"> FILENAME name of file</font></div>
<div><font color="#000000"> data signal data, each column is a channel</font></div>
<div><font color="#000000"> TYPE </font><span style="WHITE-SPACE: pre"><font color="#000000"></font></span><font color="#000000">determines dataformat</font></div>
<div><font color="#000000"> Fs</font><span style="WHITE-SPACE: pre"><font color="#000000"> </font></span><font color="#000000">sampling rate</font><span style="WHITE-SPACE: pre"><font color="#000000"> </font></span></div>
<div><font color="#000000"> </font></div>
<div><font color="#000000"> see also: ssave, sopen, swrite, sclose, doc/README</font></div></blockquote></div>
<div><br></div>
<div><br></div>
<div> Horay! But am I right in thinking this command will simply accept a matrix with rows=samples... And no provision for events or epochs? So I would have to firstly elect data by each stimulus type, and then export a version of [EEG.data] where all the epochs in the 3rd dimension were concatenated together, and then hope that there is some way to re-segment in cartool...</div>
<div><br></div>
<div>Then I searched my archives of eeglablist emails for a dim memory - the writecnt function. This looks like it might do the trick, except that my data are already epoched, and there is no equivalent "writeeeg" to write a neuroscan epoched *.eeg file...</div>
<div><br></div>
<div>Any tips - has anyone opened ICA-filtered epochs from EEGLAB in Cartool before?</div>
<div><br></div>
<div>Thanks!</div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>-hamish0</div>
<div><br></div>
<div><br></div></div></div><br><br>---------- Forwarded message ----------<br>From: arno delorme <<a href="mailto:arno@ucsd.edu">arno@ucsd.edu</a>><br>To: <a href="mailto:starz_naz@yahoo.com">starz_naz@yahoo.com</a><br>
Date: Fri, 5 Sep 2008 14:51:31 -0700<br>Subject: Re: [Eeglablist] FFT in EEG signal<br>
<div style="WORD-WRAP: break-word">Dear Starz,<br>
<div><br></div>
<div>If X is the data, nfft the size of the FFT window and srate the sampling rate. The formula below will do all channels at once if they are in the first dimension.</div>
<div><br></div>
<div>
<div style="MARGIN: 0px"> tmp = fft(X, nfft, 2);</div>
<div style="MARGIN: 0px"> f = linspace(0, srate/2, size(tmp,2)/2);</div>
<div style="MARGIN: 0px; COLOR: rgb(34,139,34)"><span style="COLOR: #000000"> f = f(2:end); </span>% remove DC (match the output of PSD)</div>
<div style="MARGIN: 0px"> tmp = tmp(:,2:size(tmp,2)/2,:); % the FFT decomposition is symmetrical </div>
<div style="MARGIN: 0px"> res = 10*log10(mean(abs(tmp).^2,3)); </div>
<div style="MARGIN: 0px"> figure; plot(f, res);</div></div>
<div><br></div>
<div>best,</div>
<div><br></div>
<div>Arno</div>
<div>
<div>
<div><br></div></div></div></div><br><br>---------- Forwarded message ----------<br>From: Fuh-Cherng Jeng <<a href="mailto:jeng@ohio.edu">jeng@ohio.edu</a>><br>To: <a href="mailto:eeglablist@sccn.ucsd.edu">eeglablist@sccn.ucsd.edu</a><br>
Date: Tue, 05 Aug 2008 17:45:49 -0400<br>Subject: [Eeglablist] What would be the best way to determine dipole locations for P300 responses?<br>Dear all,<br><br>I have recorded P300 responses using a 64-channel cap in two groups of participants and found that the P300 latencies in group A is significantly longer than those in group B. As a follow-up of this finding, I would like to do some dipole fitting and see if the P300 dipole locations are significantly different between the two groups. I have two methods in mind, but am not sure which method would be making any sense at all. sense than the other in terms of finding the dipole locations for P300 responses.<br>
<br>(1) use dipfit_erpeeg() to fit the ERP topography at the time point where the P300 latency is determined by the experimenter.<br><br>(2) do ICA first and use multifit() to do a dipole fitting on a specific ICA component that correspond the best to the P300 responses.<br>
<br><br>If anyone could help me with this or simply tell me a better way of finding the P300 dipole locations, I would greatly appreciate it.<br><br>Sincerely,<br><br>Fuh<br><br><br><br><br><br>---------- Forwarded message ----------<br>
From: Arnaud Delorme <<a href="mailto:arno@sccn.ucsd.edu">arno@sccn.ucsd.edu</a>><br>To: <a href="mailto:stllagialla@yahoo.it">stllagialla@yahoo.it</a><br>Date: Fri, 5 Sep 2008 16:22:22 -0700<br>Subject: Re: [Eeglablist] EEGLAB&FastICA<br>
<div style="WORD-WRAP: break-word">
<div>Dear Stela,</div>
<div><br></div>
<div>I retested fastica below and it works like a charm for me. Be sure to use the latest EEGLAB version available on the web.</div>
<div>Best,</div>
<div><br></div>
<div>Arno</div><br>
<div>
<div>On 12 août 08, at 04:45, stella gialla wrote:</div><br>
<blockquote type="cite">
<table cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td valign="top">
<div>Dear All</div>
<div>I have a problem with fastica toolbox.</div>
<div>I read on the eeglab tutorial that if I want to use fastica algorithm in ICA tool I have to download the fastica package and to set the path on matlab.</div>
<div>I did so but when I started ICA tool an error has shown:</div>
<div>"ERROR EEGLAB:</div>
<div>error using ==> whitenv</div>
<div>too many input arguments."</div>
<div>but I did not do anythingelse written on the eeglab tutorial (ref. KEY STEP 9:CALCULATE ICA COMPONENTS). I did not insert any commandline options and my data reply what it is reported in the "very important note".</div>
<div>what do I have to do?</div>
<div>thank you </div>
<div>kind regards</div>
<div>Stella</div></td></tr></tbody></table><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Thanks & Regards,<br>======================================<br>M.MURUGAPPAN,<br>Ph.D Scholar, School of Mechatronics Engineering, <br>Universiti Malaysia Perlis (UniMAP),<br>
02600, Jejawi, Arau, Kangar,<br>Perlis, Malaysia.<br>Phone : (006)-017-4064707 <br>E-mail: <a href="mailto:m.murugappan@gmail.com">m.murugappan@gmail.com</a><br>======================================<br><br></div>