Dear SPM -list,
I'm writing to seek clarfication on FIR analysis using SPM5. I'm running an
auditory experiment using a sparse sampling design. The design incorporates
a silent period, such that the actual interscan interval is 14s, and the
single volume image acquisition occurs 4s after the stimulus presentation to
capture peak of HRF (TR = 4.69s).
The basis function I'm using is FIR. In the time window prompt, I've
entered 4s to allow for the delay between stimulus and image acquisition. Is
this correct? I've also tried it with other values and the outputs turn out
to be identical.
Many thanks - any assistance will be much appreciated.