[caret-users] Threshold & cluster size

Katja Umla-Runge k.umla-runge at mx.uni-saarland.de
Fri Jun 15 09:04:25 CDT 2007

Hello everyone,

I'm a new Caret user and am currently trying to display t-contrast  
fMRI images (SPM99) in Caret. What kind of threshold does Caret  
require (Display control --> metric --> threshold Pos)? I performed  
uncorrected t-tests in SPM with p < .001. Is 0,001 the value to  
insert? And how would you let Caret know that a threshold refers to  
correction for multiple comparisons? If you only want those voxels  
displayed that exceed a given cluster size (e.g. minimal cluster size  
= 20 adjacent voxels), how would you go about?

Thank you for your help


Dipl.Psych. Katja Umla-Runge

Saarland University
Department of Psychology        phone: +49 - (0)681 - 302 4643
P.O.Box 151150                  fax:   +49 - (0)681 - 302 4049
D-66041 Saarbruecken            email: k.umla-runge at mx.uni-saarland.de


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