<div>thanks nathan,</div>
<div> </div>
<div>ill give it a try!</div>
<div> </div>
<div>tom<br><br> </div>
<div><span class="gmail_quote">On 1/7/08, <b class="gmail_sendername">Nathan Weisz</b> <<a href="mailto:weisz@lyon.inserm.fr">weisz@lyon.inserm.fr</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style="WORD-WRAP: break-word">
<div>hi,</div>
<div><br> </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> </div>
<div>this also fits with the standard MRI.</div>
<div><br> </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> </div>
<div>this may yield a crude but satisfactory solution if you are unable to get MRIs or individual headshapes.</div>
<div><br> </div>
<div>i'd be interested in the outcome.</div>
<div><br> </div>
<div>all the best,</div>
<div>nathan</div>
<div><br> </div>
<div><br> </div>
<div><br> </div><br>
<div>
<div><span class="e" id="q_11755068d1165a35_1">
<div>On 07.01.2008, at 16:59, thomas gilbertson wrote:</div><br></span></div>
<blockquote type="cite">
<div><span class="e" id="q_11755068d1165a35_3">
<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 onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:jan.schoffelen@fcdonders.ru.nl" target="_blank">
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 onclick="return top.js.OpenExtLink(window,event,this)" href="http://listserv.surfnet.nl/archives/fieldtrip.html" target="_blank">http://listserv.surfnet.nl/archives/fieldtrip.html</a> and <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.ru.nl/fcdonders/fieldtrip" target="_blank">
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></span></div><span class="q">
<p><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://listserv.surfnet.nl/archives/fieldtrip.html" target="_blank">http://listserv.surfnet.nl/archives/fieldtrip.html</a></p></span>
<p><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.ru.nl/fcdonders/fieldtrip/" target="_blank">http://www.ru.nl/fcdonders/fieldtrip/</a></p></blockquote></div><br>
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<div><font face="Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
<span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">--------------------------------</span></span></span></span></span></span></span></span></font></div>
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<span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans">
<span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-SIZE: 13px; FONT-FAMILY: Gill Sans">Dr. Nathan Weisz
</span></span></span></span></span></span></span></span></b></span></font></div>
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<span style="FONT-FAMILY: Gill Sans">INSERM - Unité 821</span></span></span></span></span></span></span></font></div>
<div><font face="Gill Sans" size="3"><span style="FONT-SIZE: 13px; FONT-FAMILY: Gill Sans"><i style="FONT-SIZE: 13px; FONT-STYLE: italic; FONT-FAMILY: Gill Sans"><span style="FONT-SIZE: 13px; FONT-STYLE: italic; FONT-FAMILY: Gill Sans">
Dynamique cérébrale et cognition</span></i></span></font></div>
<div><font face="Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
<span style="FONT-FAMILY: Gill Sans">Centre Hospitalier Le Vinatier, Bâtiment 452</span></span></span></span></span></span></span></font></div>
<div><font face="Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
<span style="FONT-FAMILY: Gill Sans">95 Boulevard Pinel</span></span></span></span></span></span></span></font></div>
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<span style="FONT-FAMILY: Gill Sans">69500 Bron, France</span></span></span></span></span></span></span></font></div>
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<div><font face="Gill Sans"><b style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans">
<span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans"><span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans">
<span style="FONT-WEIGHT: bold; FONT-FAMILY: Gill Sans">Tel</span></span></span></span></span></span></span></span></b></font><font face="Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
<span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
: ++33 - (0)4 - 7213 8915</span></span></span></span></span></span></span></span></font></div>
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Email:<span> </span></span></span></span></span></span></span></span></b><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
<span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:weisz@lyon.inserm.fr" target="_blank">weisz@lyon.inserm.fr
</a></span></span></span></span></span></span></span></font><font face="Gill Sans"></font></div>
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:</span></span></span></span></span></span></span></span></font><font face="Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans"><span style="FONT-FAMILY: Gill Sans">
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nathanweisz@mac.com</a></span></span></span></span></span></span></span></span></font></div>
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: </span></span></span></span><font face="Helvetica"><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://web.mac.com/nathanweisz" target="_blank">http://web.mac.com/nathanweisz</a></font></span></span></span>
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<div><font face="Gill Sans"><b>Neurotree</b>: <span style="FONT-FAMILY: Helvetica"><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://neurotree.org/neurotree/tree.php?pid=8692" target="_blank">http://neurotree.org/neurotree/tree.php?pid=8692
</a></span></font></div>
<div><br> </div>
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<i style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans"><span style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans"><span style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans">
Please avoid sending me Word or PowerPoint attachments.</span></span></i></span></font><font style="FONT-SIZE: 11px; COLOR: rgb(51,51,51); FONT-FAMILY: Bitstream Vera Sans" face="Bitstream Vera Sans" color="#333333" size="4">
<span style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-FAMILY: Bitstream Vera Sans"><i style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans"><br style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans">
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<i style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans"><span style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans"><span style="FONT-SIZE: 10px; COLOR: rgb(51,51,51); FONT-STYLE: italic; FONT-FAMILY: Bitstream Vera Sans">
See <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.gnu.org/philosophy/no-word-attachments.html" target="_blank">http://www.gnu.org/philosophy/no-word-attachments.html</a></span></span></i></span>
</font></div><span style="WORD-SPACING: 0px; FONT: 12px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; border-spacing: 0px 0px">
</span><br></span></span></span></span></span></span></span></span></div></span><br> </div><br> </div><span class="q">
<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></span><span class="q">
<p><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://listserv.surfnet.nl/archives/fieldtrip.html" target="_blank">http://listserv.surfnet.nl/archives/fieldtrip.html</a></p></span>
<p><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://www.ru.nl/fcdonders/fieldtrip/" target="_blank">http://www.ru.nl/fcdonders/fieldtrip/</a></p></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>  http://listserv.surfnet.nl/archives/fieldtrip.html</p>
<p>  http://www.ru.nl/fcdonders/fieldtrip/</p>