[caret-users] Extent threshold

[John Harwell]

Kevin,

If by "extent" you mean surface area, try using the metric clustering  
function.  Use this feature after your functional volume has been  
mapped to the surface.  It will allow you to set a range of metric  
values and a minimum surface area for clusters.  Launch the dialog  
using Attributes Menu->Metric->Clustering and Smoothing.

* Map your functional volume to the surface
* Select Attributes Menu->Metric->Clustering and Smoothing
* On the Metric Modification Dialog, set the input to the metric  
column containing your functional data, set the output to a new column.
* Press the Clustering tab, press the round button on the left of  
"Minimum Surface Area", and enter a value for the minimum surface  
area of a cluster.  Use the Cluster Values to select a range of  
metric values for the clusters.  Press the Apply button.
* Display the newly created metric column.

-----------------------------------
John Harwell
john at brainmap.wustl.edu

Department of Anatomy and Neurobiology
Washington University School of Medicine
660 S. Euclid Ave   Box 8108
Saint Louis, MO 63110



On Aug 7, 2007, at 9:22 AM, Kevin Guise wrote:

> Greetings
>
> I've searched through previous postings and the caret documentation  
> but I am
> unable to find any information regarding a method to set a minimum  
> cluster
> extent threshold while projecting functional activation onto a  
> surface map.
> Is this at all implemented in caret, or can anyone suggest an  
> equivalent
> method?
>
> Best
> Kevin
>
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