Aditya,
yes 1 file per regressor. Each will have as many rows as events, and 3
columns: onset (secs), duration (secs), value.
Check this out for more info (in the first-level section):
http://www.fmrib.ox.ac.uk/fsl/feat5/detail.html
Also, what do you mean by baseline? Is that all timepoints that are
not Task A, B or C? If that's the case, and you include 4 regressors
(i.e., Task A, Task B, Task C AND rest) you will probably end up with
bad multicollinearity in your X matrix. So make sure you know what you
are doing (the efficiency button in FEAT is a good way of helping you
check).
cheers
martin
On 28/09/10 21:48, Aditya Kumar Kasinadhuni wrote:
> Hi all,
>
> I am using the custom-3-column format for the stimulation timing files. Now, if I have 4 predictors (including baseline) in the GLM analysis, how do i specify their timings in the stimulation protocol file? Do I have to make independent timing files for each of the predictors or can I specify them in just 1 file? If so, could you please explain how?
>
> Thank you
>
|