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Many thanks Donald. I saw in the article you mentioned a diagram that I did not understood it well. The one that shows the 25 % 50 or 75% connectivity in circles. 

From this I have these  questions  :

- What does not mean and how it can be created ? 

- Say that I found using gPPI, that more than one region are connected with region X. How can I tell or get indication of which of those two regions has stronger connectivity ? Can the T value be an indicator for this ? Or the number of voxels. 

- In the PPI, is it possible to get the same region connected with itself ? I got a result where within the seed ROI there is significant activation ?


Many thanks

Aser



On Thu, Sep 24, 2015 at 12:44 AM, MCLAREN, Donald <[log in to unmask]> wrote:
This means that the connectivity of X and Y are parametrically modulated by your PM variable. For example, if swallow number is your PM and you have a positive value for the PPI PM, then you would interpret this as the connectivity is increasing with each swallow (see Humbert and McLaren 2014).

Hope this helps.

Best Regards, 
Donald McLaren, PhD


On Wed, Sep 23, 2015 at 5:58 PM, Aser A <[log in to unmask]> wrote:
Hi all,

I have a design (task) where I also included parametric modulation (PM) in. 

I think performed PPI in the main effect of the task as well as the PM. 

My question is more related to understanding the meaning of PPI in the PM. So say for example if region X was shown to be connected with region Y in the PPI of the PM. 

Does this indicate that both regions are functionally behaving in the same way and have similar relationship of the PM? 

Or in other words how would you explain this ? 

Many thanks 

Aser