
<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>hi,</div><div><br class="webkit-block-placeholder"></div><div>on the fieldtrip FTP there is a standard BEM (standard_vol.matr). i think you could use the skull part as pseudo-headshape:</div><div>vol.bnd(1).pnt</div><div><br class="webkit-block-placeholder"></div><div>this also fits with the standard MRI.</div><div><br class="webkit-block-placeholder"></div><div>there may be some transformation you have to apply to these "headshape" points so that the head fits nicely into the sensor array.</div><div>then you can use prepare_localspheres and specify a lower number in cfg.spheremesh (perhaps something like 50; default is 4000).</div><div><br class="webkit-block-placeholder"></div><div>this may yield a crude but satisfactory solution if you are unable to get MRIs or individual headshapes.</div><div><br class="webkit-block-placeholder"></div><div>i'd be interested in the outcome.</div><div><br class="webkit-block-placeholder"></div><div>all the best,</div><div>nathan</div><div><br class="webkit-block-placeholder"></div><div><br class="webkit-block-placeholder"></div><div><br class="webkit-block-placeholder"></div><br><div><div>On 07.01.2008, at 16:59, thomas gilbertson wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>dear jan mathijs,</div> <div> </div> <div>i have been generating a single shell model from the segmented mri. the localisation proceedure is for a tactile stimulus so when i see a contralateral S1 response i have some reason to belive that the algorithm is making some sense. I get the impression from your reply that there is no easy way to get around this lack of anatomical data and that i may just have to go and get the mri's done for this couple of subjects! </div> <div> </div> <div>thanks for your thoughts on this,</div> <div> </div> <div>tom.</div> <div><br> </div> <div><span class="gmail_quote">On 1/7/08, <b class="gmail_sendername">Jan Mathijs Schoffelen</b> <<a href="mailto:jan.schoffelen@fcdonders.ru.nl">jan.schoffelen@fcdonders.ru.nl</a>> wrote:</span> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Dear Tom,<br><br>As far as I know, the 'ctf-format' standardised mri does not exist. Creating an anatomically accurate forward model, while the actual anatomical information is lacking, is tricky business. What kind of forward model do you actully use? The multiple sphere model based on the ctf-shape files? If so, you could try to come up with an 'averaged' multipsphere model (thus bypassing the need for a standardised MRI), although this is not trial.  However, I wonder whether this would yield better results than just taking an 'averaged' single sphere model. <br>I wonder what you mean by your statement that localisation is much more accurate when using ctf-formatted MRIs. Do you  know where your activation should end up then?<br><br>The function beamformer_pcc is as far as I know still in its experimental stage and only for use within the FC Donders Centre. However, beamformer_dics shares most of the functionality, but obviously not all of it. <br><br>Regards,<br><br>Jan-Mathijs<br><br>----------------------------------<br>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. See also <a href="http://listserv.surfnet.nl/archives/fieldtrip.html">http://listserv.surfnet.nl/archives/fieldtrip.html</a> and <a href="http://www.ru.nl/fcdonders/fieldtrip">http://www.ru.nl/fcdonders/fieldtrip</a>.<br></blockquote> </div><br><p>----------------------------------</p><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>  <a href="http://listserv.surfnet.nl/archives/fieldtrip.html">http://listserv.surfnet.nl/archives/fieldtrip.html</a></p><p>  <a href="http://www.ru.nl/fcdonders/fieldtrip/">http://www.ru.nl/fcdonders/fieldtrip/</a></p> </blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 1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span" style="font-family: Gill Sans; font-size: 13px; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-size: 13px; font-weight: bold; ">Dr. Nathan Weisz</span></span></span></span></span></span></span></span></b></span></font></div><div><font class="Apple-style-span" face="Gill Sans" size="3"><span class="Apple-style-span" style="font-size: 13px;; font-family: Gill Sans; "><br class="khtml-block-placeholder"></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">INSERM - Unit� 821</span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans" size="3"><span class="Apple-style-span" style="font-size: 13px;; font-family: Gill Sans; "><i style="font-family: Gill Sans; font-size: 13px; font-style: italic; "><span class="Apple-style-span" style="font-family: Gill Sans; font-size: 13px; font-style: italic; ">Dynamique c�r�brale et cognition</span></i></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">Centre Hospitalier Le Vinatier, B�timent 452</span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">95 Boulevard Pinel</span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">69500 Bron, France</span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><br class="khtml-block-placeholder"></font></div><div><font class="Apple-style-span" face="Gill Sans"><b style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; ">Tel</span></span></span></span></span></span></span></span></b></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">: ++33 - (0)4 - 7213 8915</span></span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><b style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; ">Email:<span class="Apple-converted-space"> </span></span></span></span></span></span></span></span></b><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><a href="mailto:weisz@lyon.inserm.fr">weisz@lyon.inserm.fr</a></span></span></span></span></span></span></span></font><font class="Apple-style-span" face="Gill Sans"></font></div><div><font class="Apple-style-span" face="Gill Sans"><b style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; ">Chat-AV</span></span></span></span></span></span></span></span></b></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">:</span></span></span></span></span></span></span></span></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "> <a href="mailto:nathanweisz@mac.com">nathanweisz@mac.com</a></span></span></span></span></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><b style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; "><span class="Apple-style-span" style="font-family: Gill Sans; font-weight: bold; ">Homepage</span></span></span></span></span></span></span></span></b></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">: </span></span></span></span><font class="Apple-style-span" face="Helvetica"><a href="http://web.mac.com/nathanweisz">http://web.mac.com/nathanweisz</a></font></span></span></span></span></font></div><div><font class="Apple-style-span" face="Gill Sans"><b>Neurotree</b>: <span class="Apple-style-span" style="font-family: Helvetica; "><a href="http://neurotree.org/neurotree/tree.php?pid=8692">http://neurotree.org/neurotree/tree.php?pid=8692</a></span></font></div><div><br class="webkit-block-placeholder"></div><div style="font-size: 9px; "><font class="Apple-style-span" color="#333333" face="Bitstream Vera Sans" size="4" style="font-size: 11px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><span class="Apple-style-span" style="font-size: 10.8px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><i style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; ">Please avoid sending me Word or PowerPoint attachments.</span></span></i></span></font><font class="Apple-style-span" color="#333333" face="Bitstream Vera Sans" size="4" style="font-size: 11px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><span class="Apple-style-span" style="font-size: 10.8px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><i style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "><br style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "></i></span></font><font class="Apple-style-span" color="#333333" face="Bitstream Vera Sans" size="4" style="font-size: 11px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><span class="Apple-style-span" style="font-size: 10.8px; ; color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; "><i style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; "><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Bitstream Vera Sans; font-size: 10.8px; font-style: italic; ">See <a href="http://www.gnu.org/philosophy/no-word-attachments.html">http://www.gnu.org/philosophy/no-word-attachments.html</a></span></span></i></span></font></div><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "></span><br class="Apple-interchange-newline"></span></span></span></span></span></span></span></span></div></span><br class="Apple-interchange-newline"> </div><br></body></html><p>----------------------------------</p>

<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>