The con_*.img, ess_*.img, spmT_*.img, and spmF_*.img are not effected in anyway by None/FWE/FDR selection or changing the spatial extent.<div><br></div><div>Selecting None/FWE/FDR only changes what is shown in the results display. None makes no voxel-wise correction. FDR does not take into account the spatial resolution, it simply uses a formula based on the number of voxels in the image. FWE takes into account the spatial resolution/smoothness in computing the voxel-wise correction. Both correction methods are correcting for the significance at the voxel level.</div>
<div><br></div><div>The spatial extent threshold is completely separate of the the correction above. Anytime you set the extent threshold above 0, it looks for clusters that have at least that many (edge-connected, I believe) contiguous  voxels. The results display will be unchanged if all the clusters in the image were larger than the spatial extent threshold set compared to when it was set to zero.</div>
<div><br></div><div>Hope that answers your question.<br><br><div class="gmail_quote">On Mon, Jul 13, 2009 at 4:38 PM, Yaman Aksu <span dir="ltr">&lt;<a href="mailto:[log in to unmask]"><a href="/cgi-bin/wa-jisc.exe?LOGON=A3%3Dind0907%26L%3DSPM%26E%3Dquoted-printable%26P%3D3080113%26B%3D--0016e64755aa201476046ea57729%26T%3Dtext%252Fhtml%3B%2520charset%3DISO-8859-1%26pending%3D" target="_parent" >[log in to unmask]</a></a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">For None (among None/FWE/FDR), I would like confirmation that the inference that is<br>
computing spmT_*.img is indeed on an entirely voxel-by-voxel basis (i.e. makes no use of<br>
spatial relations of voxels). This is to mainly confirm that Random Field Theory, which I am<br>
aware is used by FWE, is definitely not being used by None.<br>
P.S.: When using None, as a useful thing I checked spmT_*.img was not affected by the<br>
choice of Extent Threshold value (e.g. 0 or 10), but I believe this check is not sufficient for<br>
the confirmation I&#39;m asking for.<br>
Thank you.<br>
</blockquote></div><br><br clear="all"><br>-- <br>Best Regards, Donald McLaren<br>=====================<br>D.G. McLaren<br>University of Wisconsin - Madison<br>Neuroscience Training Program<br>Office: (608) 265-9672<br>Lab: (608) 256-1901 ext 12914<br>
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