functional connectivity maps

Submitted by Helen Sawaya on
 Dear all,

I am new to DPARSF and I have a question concerning the z transformed functional connectivity maps. I am a bit surprised at the results because the z values of my maps are pretty low (most are between -0.6 and 1). I did not globally regress my images and I expect at least a few voxels to have values of 3 or 4. Anyone has any ideas as to why that is happening?

I appreciate your help

Thank you
Helen

 Thank you for your reply.
My seed is a region in the ventromedial PFC. I will attach the zFC maps for one of the subjects. The threshold I used to view this image is z=0.5 because anything above that would remove all activation.

Thank you
Helen

(I have uploaded the file to the server, please do let me know if you have received it. Thanks)

 i m sorry that i cannot find your attachment. 
and i do agree with Dr. Zang's comment that the z transformed FC map is largely depended on the seed region location.

i checked my zFC map when i put seed region in PCC, one of the key regions in default mode network, and found for individual map, the z value is not as big as you thought. Even in PCC areas which is near by the seed region, the z value is less than 1.9.




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