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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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