I have a small group of healthy volunteers scanned twice under 2 different conditions.
We project a visual stimulus formed by 2 type of images (image1, image2).
In the first run subjects have to look a visual stimulus and the second run they have to count the image2.
My EVs are image1 and image2 for both the runs and I am interested to calculated their Activation and Deactivation.
I feed feat directories into the second level analysis.
I would like to distinguish Activation and Deactivation of my two regressors in paired t test.
How can I do?
How can i set contrast masking?
Thanks for any advice.
Anna