Hi Moises,
Many thanks for your answer. I thought initially the same as you, but the article I mentioned deliberately chose nfiber=3 for all diffusion MRI protocols and for non-HARDI protocols got among the best results with bedpostx with this choice of parameter, including for 3-fiber configurations (figure 6 on that paper). Would then advise to disregard these particular findings and just stick to nfiber=2 for all the reasons you mentioned previously?
Best,
Michael
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