Use a contrast for the PM modulator and then test if the PM is different than 0 at the group level using a 1-sample t-test.

Best Regards, 

Donald McLaren, PhD

On Thu, Aug 13, 2015 at 1:42 PM, Joelle Zimmermann <[log in to unmask]> wrote:

Hi Experts,

I'm setting up a second-level analysis, where I plan to examine how activation across trials is related to behaviour across trials. I was hoping someone would have some suggestions of how to practically implement this in SPM.

I have a task, with 10trials (with rest periods in between), and one behavioural measure per trial.

For each subject, I did a first-level analysis with one condition with 10 onsets, and a parametric modulator where I put in behavioural performance. So first column of the design matrix is task versus rest, the second column is behavioural performance, and the next 6 are motion parameters.

Now I want to set up a second-level model. Does anyone have ideas of how I can look at how behaviour and activation are related at this level? And also how I can implement this design in the GUI?

Thanks,

Joelle