Many thanks Peter. So it is not part of the basic analysis of a typical fmri task activations? only in dcm. Aser Sent from my Samsung Galaxy smartphone. -------- Original message --------From: Peter Mondrup Rasmussen <[log in to unmask]> Date: 04/12/2017 22:12 (GMT+00:00) To: fmri2013 <[log in to unmask]>, [log in to unmask] Subject: Re: [SPM] Balloon model spm Hi Aser, The balloon model is used as part of the dynamical causal modeling framework (chapter 35) Best, Peter On 12/04/2017 10:39 PM, fmri2013 wrote: Many thanks Peter. I do not see how the balloon model is implented in spm. Or it is just using these basis functions instead? Aser Sent from my Samsung Galaxy smartphone. -------- Original message -------- From: Peter Mondrup Rasmussen <[log in to unmask]> Date: 04/12/2017 21:31 (GMT+00:00) To: fmri2013 <[log in to unmask]>, [log in to unmask] Subject: Re: [SPM] Balloon model spm Hi Aser, Chapter 8 in the SPM manual contains the relevant information about how hemodynamic responses are modeled (in the GLM) http://www.fil.ion.ucl.ac.uk/spm/doc/manual.pdf#chapter.8 and specifically http://www.fil.ion.ucl.ac.uk/spm/doc/manual.pdf#section.8.4 Hope this helps, Best regards, Peter On 12/04/2017 07:09 PM, fmri2013 wrote: Hi All Sorry this might be a naive question: Does spm in the normal analysis of task or event related fmri use or apply the balloon model? Or it uses the double gamma function for the HRF? I could not find explanation regarding this in the list or in the manual. If there is a link or reference please let me know Thanks Aser Sent from my Samsung Galaxy smartphone.