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<br><br><hr id="stopSpelling">Date: Sat, 17 Jul 2010 17:26:34 -0500<br>From: lumatobu2@HOTMAIL.COM<br>Subject: [FIELDTRIP] Help with dipole fitting<br>To: FIELDTRIP@NIC.SURFNET.NL<br><br>
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Hi everyone. Im trying to make a forward computation of the dipole potentials measured in the scalp. I'm following this example:<br><br>http://fieldtrip.fcdonders.nl/example/compute_forward_simulated_data_and_apply_a_dipole_fit<br><br>but in the part that they describe the two dipole computations:<br><pre class="code">% create a dipole simulation with two dipoles and a custom timecourse<br><br>I dont understand why they take the dipole moments like this:<br><br>cfg.dip.mom = [ % each row represents [qx1 qy1 qz1 qx2 qy2 qz2]<br> 1 0 0 0 0 0 % this is how signal1 contributes to the 6 dipole components<br> 0 0 0 1 0 0 % this is how signal2 contributes to the 6 dipole components<br> ]'; % note, it should be transposed<br><br>¿Does it mean that if I have three dipoles, the dipole moment should be like this? :<br><br>cfg.dip.mom = [<br> 1 0 0 0 0 0 0 0 0<br> 0 0 0 1 0 0 0 0 0<br> 0 0 0 0 0 0 1 0 0<br>]';<br><br>¿And to four dipoles, like this?<br><br>cfg.dip.mom = [<br> 1 0 0 0 0 0 0 0 0 0 0 0<br> 0 0 0 1 0 0 0 0 0 0 0 0<br> 0 0 0 0 0 0 1 0 0 0 0 0<br> 0 0 0 0 0 0 0 0 0 1 0 0<br>]';<br><br>¿ And what if I have 128 dipoles?<br><br>PLEASE HELP ME UNDERSTAND THIS, BECAUSE IM GETTING AN ERROR IF I FOLLOW THIS RULE TO 128 DIPOLES AND I THINK THIS IS A MISTAKE<br><br>OTHER THING IS HOW CAN I COMPUTE THE FORDWARD ELECTRODE POTENTIALS, NOT JUST THE POSITIONS.<br><br>PLEASE HELP ME !!!!!<br></pre><br> <br><hr>Explore the seven wonders of the world <a href="http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE">Learn more!</a>
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<p>The aim of this list is to facilitate the discussion between users of the FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis.</p>
<p> http://listserv.surfnet.nl/archives/fieldtrip.html</p>
<p> http://www.ru.nl/fcdonders/fieldtrip/</p>