Hello;
I'm PhD student, I am interested in using SPM to study MRI data sets, that's consists on using several images(positive, negative and neutre) that the subject watch. Study the comportement.
I have a block paradigm: 18s off-18s Positive- 18s off-18s Negative- 18s off-18s Neutre- 18s off-18s Neutre- 18s off-18s Positive- 18s off-18s Negative- 18s off-18s Negative- 18s off-18s Neutre- 18s off-18s Positive
Every three seconds correspond to the acquisition of a volume.
there is 26 volumes on the total.
Tr=3s
how can I specify the ONSETS and the conditions?
thank you
|