I search a free software for real time neurofeedback study. I am aware of FSL-based FRIEND and I have just heard of AFNI based program. I plan to do my offline analysis with SPM. My search is for the online real time analysis and display of the neurofeedback back to participant. Is there anyone who had used both of them?
Let me know your progress on this. I have a parallel study, not fMRI however, that would couple well.
I would also recommend AFNI for this purpose. You can easily adapt it to do basic realtime (provide the average activation within an ROI). It also contains the software to do realtime based on a Support Vector Machine approach. As a starting point start afni with the -rt option (afni -rt) and then in the plugins menu check the options and help for RT 3dsvm and RT Options.
I have used TurboBrainvoyager together with a home-made visual basic presentation script for the feeback information.
Turbo-BrainVoyager allows for online processing and prepares the files for offline advanced analysis. This software is commercial, but comes with good support. AFNI is indeed a good alternative.