Returning to the mixed design, I still have a question. When we prepare the parfile as you said, how to set a timewindow for the analysis if we have a long block (30s)? In my mind, the timewindow for block and event should not be the same. The timewindow is always set as 2TRs( pre-stimulus)+14s+ max_stim_ duration in event-related design and 2 block (in seconds) -1TR in block design. So, how to reconcile them in mixed design.

2008/3/12, Doug Greve <greve@nmr.mgh.harvard.edu>:

If you are using the 4-column par file, then just code them as separate, overlapping events, ie. If condition 1 is the block (lasting 10 sec) and condition 2 is the event (lasting 2 sec), then

0 1 10 1 ---> starts at t=0, lasts 10 sec
0 2    2   1 ----> starts att=0, lasts 2 sec
5 2    2   1 ----> starts at t=5, lasts 2 sec
7 2     2 1 ---> starts at t=7, lasts 2 sec

The last col of 1s just means that the event weight is one (probably what you want).

doug

Zhen Zonglei wrote:

Dear, Dr. Greve:

I hope I don't bother you too much. But I'm wondering about how to analyze mixed blocked/event related design with FSFAST. In our experiment, we have two blocked conditions and three event-related conditions in every block. We are not sure how to write the parfiles and construct the model to analyze these data in FSFAST.

Please give us some suggestions on this issue.

Thanks in advance.

Zonglei Zhen
-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
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