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The simplest equation for getting a BOLD signal from neurotransmitter that I could find was in "Tracing Problem Solving in Real Time: fMRI Analysis of the Subject-paced Tower of Hanoi", which itself references many other publications where it was used: $$H(t)= m \times(t/s)^a\times e^{-(t/s)}$$ The parameters $s$, $a$ and $m$ don't have an explicit meaning....


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There two 7 Tesla data sets currently publicly available, bith within the OpenfMRI data collection Here is a link to a 350 GB data set for 20 subjects watching the audio version of Forrest Gump. The authors also have all the scripts available at Github to enable reproduction. The associate publication can be found here. The other 7T data set you allready ...



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