[Freesurfer] gammafit flag in mkanalysis-sess

Hi Freesurfers

I have a few questions about gammafit flag in mkanalysis-sess command and I appreciate if you could respond whenever you had time.

-How should we decide which function is best to apply on hemodynamic response signal? I have used both spmhrf and gammafit and I see slightly different results.

-Does Freesurfer has a default function that applies on hemodynamic response signal if I don't use these flags?

-Where should I get gfdelta and gftau from?

Thanks

Mona

Zahra (Mona) Nasiriavanaki

Postdoctoral Research Fellow

Martinos Center for Biomedical Imaging

Massachusetts General Hospital

149 13th Street, 149-2615

Charlestown, MA, USA, 02129