The current stream actually does not run with fixation -- all the fmri
data need to have wedge or ring stimulation. The design matrix is just a
bunch of sines and cosines, nothing fancy.
Jeff Phillips wrote:
Hello all,
I am performing my first retinotopy analysis, and I'd like to get some
more information about the model created by paradigm files in the
retinotopy analysis. Specifically, I am unsure whether to include or
exclude fixation periods from the ends of my retinotopy runs. I
imagine the analysis must somehow take into account the slow drop-off
of the BOLD response--can you tell me if/how it does so? Since the
analysis asks for the number of cycles, but not the duration of each
cycle, I worry that including extra timepoints will just result in FS
concluding that my stimulation period is longer than it actually is.
If there exists an example design matrix for the retinotopy analysis,
that would also be useful.
Thanks,
Jeff Phillips
University of Pittsburgh
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