<font class="Apple-style-span" face="arial, helvetica, sans-serif">Dear all,</font><div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br></font></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif">As far as I know it is possible to reconstruct the time-course of the sources (obtained using sourceanalysis) by projecting/multiplying the filter-weights on the data.</font></div>
<div><span class="Apple-style-span" style="white-space: pre;"><font class="Apple-style-span" face="arial, helvetica, sans-serif">In my case, the specific code I am using is:</font></span></div><div><span class="Apple-style-span" style="white-space: pre; "><p class="p1">
<font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"> <span class="s1">for</span> i=1:nvoxels(inside)</font></p><p class="p1"><font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"> <span class="s1">for</span> tr=1:ntrials</font></p>
<p class="p1"><font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"> ts(tr,:)=(source.avg.ori{source.inside(i)}(1,:)*source.avg.filter{source.inside(i)}*data2{condit}.trial{tr});</font></p>
<p class="p1"><font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"> <span class="s1">end</span></font></p><p class="p1"><font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"> datvx(i,:,:)= single_trial_time_course</font></p>
<p class="p1"><font class="Apple-style-span" size="2" face="arial, helvetica, sans-serif"></font><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; ">end</span></p><font class="Apple-style-span" face="arial, helvetica, sans-serif">I used a common filter with 3 different conditions, thus I think this is the only way I have to reconstruct the activity for one of the conditions.</font></span></div>
<div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><span class="Apple-style-span" style="white-space: pre;">My Question is about how to apply the NAI normalization here. Can I just divide the output of the source reconstruction by the projected noise of the filter? I am tempted to do something like that</span></font></div>
<div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><span class="Apple-style-span" style="white-space: pre;"><br></span></font></div><div><font class="Apple-style-span" face="arial, helvetica, sans-serif"><span class="Apple-style-span" style="white-space: pre;"></span></font><span class="Apple-style-span" style="font-family: arial, helvetica, sans-serif; white-space: pre; ">datvx(i,:,:)= single_trial_time_course ./ repmat(noise(inside),[size(ts,1), size(ts,2)]</span></div>
<meta charset="utf-8"><div><span class="Apple-style-span" style="white-space: pre; "><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br></font></span></div><div><span class="Apple-style-span" style="white-space: pre; "><font class="Apple-style-span" face="arial, helvetica, sans-serif">That is, I divide the power by the noise estimate (for each voxel) in every trial and time-point. Could anyone tell me whether this is a correct way to procedure? Any other workaround?</font></span></div>
<div><span class="Apple-style-span" style="white-space: pre; "><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br></font></span></div><div><span class="Apple-style-span" style="white-space: pre; "><font class="Apple-style-span" face="arial, helvetica, sans-serif"><br>
</font></span></div><div><span class="Apple-style-span" style="white-space: pre; "><font class="Apple-style-span" face="arial, helvetica, sans-serif">Thanks in advance!</font></span></div><div><br></div><div>-- </div><div>
Marc Recasens<br>Tel.: +34 639 24 15 98<br><br>
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