Hello SPMers,
I am currently trying to analyse some er-fMRI data collected using a
sparse sampling paradigm with SPM5. I would like some guidance with the
specification of the timing parameters in the design matrix.
I have a TR of 8secs in which a stimulus was presented 1 second into the
event. I then have a 5 second response period and then a TA of 2secs in
which a whole brain volume is acquired at the end of the event.
I have consulted the mailing list archives and tried altering the number
of time bins and the microtime onsets but without much success. I also
have the “duration” parameter held within the condition tree set at 0.75,
rather than the default 0, as 6/8seconds were when the scanner was silent.
If you could suggest the correct specifications for the timing parameters
and duration length I would be very grateful.
Thank you in advance
Rachel
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