[caret-users] Viewing multiple functional maps

[John Harwell]

Alex,

One way to display a metric overlayed over another is to display the  
first metric, convert the coloring to RGB Paint, set RGB Paint as the  
underlay, and then display the second metric as the Primary Overlay.

* Display your first metric as desired.
* Select Attributes Menu->Copy Current Coloring to RGB Paint.  If  
desired, replace "New Column Name" with a more appropriate name.   
Press the OK button.
* On the Display Control Dialog's Overlay/Underlay Surface page,  
change the Underlay to RGB (you should not notice any change in  
surface coloring at this time).
* Display your second metric as the Overlay.


One way to identify areas of overlap is to use Surface Menu->Region  
of Interest Operations.  This method identifies nodes that are active  
in two or more metric columns.

* On the Display Control, set the Metric to display one of your data  
columns.
* Select Surface Menu->Region of Interest Operations.
* Set the Selection Method to Nodes WIth Metric.  Set the Low and  
High threshold to values appropriate for your data.  Press the Select  
Nodes button.  You should see your functional areas colored green in  
the Main Window.
* Use the Display Control to display a different metric data column.
* Back on the ROI dialog, adjust the Low and High threshold values if  
needed.  Change "Normal Selection" to "And Selection (Intersection)"  
and press the Select Nodes button.  Any nodes that are selected  
(green in the main window) overlap between the two metric columns.
* In the Operate on Selected Nodes section, set the Operation to  
Assign Paint Attributes to Selected Nodes.  Enter a name for the  
Paint Column and a Paint Name.  Press the Assign Paint button.  Set  
the paint color as desired.  This paint is used to identify the  
overlapping regions.
* Press the Close button on the ROI dialog.
* Set the Paint as the overlay to display the overlapping regions.

-----------------------------------
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 Oct 20, 2007, at 7:56 PM, Alexander Fornito wrote:

> Hi all,
> Is there anyway to view more than one functional map (i.e., stat  
> image) on
> the PALS atlas simultaneously?
> I have mapped the results of a series of contrasts onto the atlas  
> and now
> have a .metric file with each contrast as a different column.  
> However, I
> only seem to be able to view one contrast at a time.
> I can't seem to find any documentation on this.
> Ultimately, I would like to overlay two maps simultaneously (each  
> coloured
> using a different palette).
> Also, if it is possible to view >1 map at the same time, is there some
> option to colour areas of overlap between the maps differently?
> Thanks for your help,
> Alex
>
>
>
> Alex Fornito
> JN Peters Research Fellow
> Melbourne Neuropsychiatry Centre
> National Neuroscience Facility
> The University of Melbourne
> Levels 2 & 3, 161 Barry St
> Carlton South 3053 Vic Australia
> Ph:    +61 3 8344 1861
> Fax:   +61 3 9348 0469
> Email: fornitoa at unimelb.edu.au
>
>
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