<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Dear John,<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">what I am correlating are the lead field produced using <font face="verdana,sans-serif">subject-specific
realistic FEM head model </font> or BEM head model and concentric spheres head model. As Vladimir suggested, this should help me to find the proper inward shift to apply in order to achieve good results with the BEM model. Unfortunately, the BEM model still seems not to work properly. <br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Anyway, given the results of the latest attempts, I will definitely use the FEM model for my analysis, even if it is takes much longer to create the head model and lead fields. <br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks again!<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Best,<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Debora<br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Mar 17, 2016 at 3:57 PM, RICHARDS, JOHN <span dir="ltr"><<a href="mailto:RICHARDS@mailbox.sc.edu" target="_blank">RICHARDS@mailbox.sc.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div><font style="font-family:verdana,sans-serif" face="Calibri,sans-serif">"The correlation between concentric spheres and FEM (attached) it is not so bad” . </font><font face="verdana,sans-serif">I</font><font style="font-family:Calibri,sans-serif" face="verdana,sans-serif"> am
not sure what you are correlating. Is this over the </font><font face="Calibri,sans-serif">time</font><font style="font-family:verdana,sans-serif" face="Calibri,sans-serif"> of a </font><font face="verdana,sans-serif">beamformer</font><font face="Calibri,sans-serif"><font face="verdana,sans-serif"> model,
or over participants with a single-time model? In either case, </font>I<font face="verdana,sans-serif"> think the correlations for the FEM-Concentric spheres are bad, many are less < 0.8, and a number are in the range from .9 to .95. </font></font></div>
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<div><font face="verdana,sans-serif"><font face="Calibri,sans-serif">This result confirms the </font>difference in the FEM and concentric-sphere models. These are exacerbated even </font><font face="verdana,sans-serif">further when you use a subject-specific
realistic FEM model and a concentric spheres model.</font></div>
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<div>The results between the BEMCP and concentric spheres suggests that the BEMCP model is not working. Most of the correlations should be positive. I have not used correlations as you have, but have done ROIs in an individual, and correlated the values of
the ROIs over the head for one subject, or multiple subjects. I find higher correlations for the BEMCP and Concentric sphere models, than between either of these and a FEM model. However, in my case I am not using the standard model from FT, but using subject-specific
BEMCP, concentric spheres, and FEM models.</div>
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<div>If the FEM model is working for you, why not use it?</div><span class="">
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<div>John</div>
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<div style="font-family:Consolas;font-size:medium">John E. Richards Carolina Distinguished Professor</div>
<div style="font-family:Consolas;font-size:medium">Department of Psychology</div>
<div style="font-family:Consolas;font-size:medium">University of South Carolina</div>
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</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div><div><div><div><div><div><font face="verdana,sans-serif"><br>Debora Desideri</font><font face="verdana,sans-serif">, PhD Student<br></font></div></div><font face="verdana,sans-serif">BNP Lab - Neurology Department<br></font></div><font face="verdana,sans-serif">University Hospital Tübingen<br></font></div><font face="verdana,sans-serif">Eberhard Karls University Tübingen<br></font></div><font face="verdana,sans-serif">Hoppe-Seyler Str. 3<br></font></div><font face="verdana,sans-serif">D-72076 Tübingen<br></font></div><font face="verdana,sans-serif">Tel: +49 7071/29 80478<br></font><div><div><div><font face="verdana,sans-serif"><br></font></div></div></div></div></div></div></div>
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